I would be happy to start with the cultural gaps in B.
1) Ancient Mesopotamian cultures:
The major Mesopotamian cultures are the Sumerian, Akkadian, Babylonian and Assyrian. These major civilizations are now only represented by a single WHS: Ashur.
Major Sumerian sites: Ur, Uruk, Eridu, Nippur, Lagash and Mari. All of these cities were later occupied by the Akkadians and the Babylonians
The location of the city of Akkad is unknown. The most significant city related to the Akkadian culture is Ebla, which is outside Mesopotamia.
Babylon was the capital city of the Babylonian Empire.
The major Assyrian cities are Ashur, Harran, Nimrud and Nineveh.
Of all these sites Nimrud, Nineveh, Harran, Babylon, Ur, Ebla and Mari are on the T lists (Mari and Ebla are in Syria, Harran in Turkey and the rest in Iraq). In order to fill up the gap Ur, Mari, Ebla, Babylon and one of the later Assyrian sites would probably have to be included.
2) Anatolian cultures:
Anatolian cultures include (chronologically unordered) the Lycians, Phrygians, Hurrians, Hittites, Assuwans, Lydians as well as neolithic sites. The most important sites are Troy (Assuwan), Ephesos (Lydian), Gordium (Phrygian), Erbil and Ahlat (Hurrians), Hattusha (Hittite), Dalyan (Lycian) and Goebeklitepe and Catalhoeyuek (Neolithic). Of these Catalhoeyuek, Troy and Hattusha are WHSs. Nonetheless, all other sites are on the Turkish T-list (except Erbil which is on the Iraqi T-list). The Turkish T-list even lists some further more minor sites belonging to these cultures. In order to fill up this gap sites representing each of these cultures would probably have to get inscribed.
3) Ancient Egypt: The most significant missing sites are on the T-list: Siwa, Fayoum, Amarna and Dahshour. Ancient Egypt currently has three WHSs. It was such an important ancient culture that it probably deserves at least several more nominations.
4) Seljuk and Ottoman Empires: Since the publication of the gap document several Ottoman sites have been nominated (Edirne, Visegrad, Butrint, Mostar). Other major Ottoman sites include Istanbul and Saftanbolu. A missing site would be Bursa which is the origin of the Ottomans.
The Seljuk Empire is currently represented only by Dvirigi. Konya is meant to fill up this gap.
Both Konya and Bursa are on the Turkish T-list and would have to be included to close this gap.
5) Central Asia (cultural) - With the expected nomination of the two silk road entries this gap is probably going to be closed. The major cultural sites from this area have now been nominated (Merv, Bukhara, Urgench, Turkestan, Khiva, Samarkand, Nisa). Other sites are the Neolithic Sarasm, the sacred Mt Soleyman-To and the rock art of Tamgaly.
The postmodern architecture of Astana could be an interesting contribution.
6) Pacific except Australia (cultural) - This gap involves several sub-categories: Pacific archaeology, living indigenous religions, colonial and modern heritage, agricultural practices and vernacular architecture. I will address each of them separately:
Archaeology - Major sites are the Lapita sites from Tonga and Samoa (T-list), Rapa Nui (inscribed), Nan Madol, Micronesia (T-list) and Raiatea, French Polynesia (T-list).
Rock art is represented in Rock Island (Palau) and Roi Mata (Vanuatu).
Living indigenous religions - Probably best represented by CLs. Represented on the list with Tongariro (NZ) and Roi Mata (Vanuatu). Manono CL (Samoa) is on the T list. Papuan religious practices are not currently represented (Trans-Fly and Sepik on the T-list could relate). The rock money of Micronesia is on the T-list of Palau and Micronesia.
Agricultural pratices - Kuk (PNG) is currently the only WHS. Houn (PNG) is on the T-list. No sites from Polynesia, which is a major shortcoming.
Modern and Colonial sites: Levuka (Fiji) and Bikini (Marshalls) are WHSs. Napier (NZ) is on the T-list.
Vernacular architecture: Most prominent examples are from Papua, e.g. the Korowai tree houses that are unique in the entire world (West Papua). No such sites are on current T-lists.
To close this gap several further nominations would be necessary. Nan Madol, Lapita sites and Rajatea are probably compulsory. Indigenous CLs, Polynesian agricultural practices and vernacular architecture have to be elaborated. Examples of postulated CLs are presented in http://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CEAQFjAC&url=http%
Only one of them (North Kohala, Hawaii) represents Polynesian agricultural practices. None include examples of vernacular architecture.
7) Central Africa (cultural), e.g. Bantu states:
Currently only Lope-Okanda (Gabon). There were three Bantu states: Kongo, Luba and Lunda. Only Kongo is on the T-list: M'Banza Kongo (Angola). The other two are not represented. The less known kingdom of Mbe is on the Rep. Congolese T-list.
Colonial sites are represented on the T-list: Albert Schweizer Hospital (Gabon), Loango (Rep. Congo) and churches (Angola). Cultural landscapes (Minkebe, Gabon) and rock art (DRCongo) are present on the T-lists.
In order to close up this gap several nominations are necessary: M'Banza Kongo and some Luba/Lunda site for the Bantu kingdoms and at least some colonial site.
8) Post independence sites from the Americas: I shall skip this category as all independent states in the Americas are relatively new and fall under the categories of modern heritage, modern town planning and non-European technological sites.
9) Precolumbian cultures (except Mayan): Major cultures are Inuit (Eskimo), Mississipi, Pueblo, Olmec, Zapotec, Aztec, Intermediate Zone, Taino, Amazonian, Chachapoyas, Wari, Inca, Moche/Chimu, Paracas/Nazca, Tiwanaku, Pachacamac, Caral, Chavin, Chinchorro, Atacama, Palaeoindian.
Some of the cultures are (well) represented: Pueblo (Chaco, Taos, Mesa Verde), Mississippi (Cahokia), Zapotec (Monte Alban, Mitla), Aztec (Mexico City, Teotihuacan), Caral, Chavin, Tiwanaku and Nazca.
Inuit is a living culture and has some T-list entries (Canada, Greenland) for CLs.
No Olmec sites have been left authentic and worthy of inscription.
The Intermediate Zone is represented by Tierradentro and Agustin (Colombia). Ciudad Perdida (Colombia) and Guyalbo (Costa Rica) are major sites that are missing. CP is on the T-list. Guyalbo was on the CR T-list and has been removed.
Taino culture is not represented and has no T-list entries. The most prominent site is Caguana (Puerto Rico).
No Amazonian sites are present. The most prominent one is Kuhikugu (Brazil), not on T-list.
Rio Abiseo has some Chachapoyas representation, but the major site of Kuelap is missing (on T-list).
Wari (Peru) is not on the T-list.
The Inca culture is heavily underrepresented, with only Machu Picchu, Cuzco and maybe Chapaq Nan next year. Some further nominations such as Ingapirca (Ecuador T-list), Titicaca (Bolivia T-list), Sacred Valley sites and Otuzco (Peru, not on T-list) are mandatory.
Chan-Chan represents the Moche-Chimu culture, but further nominations are necessary (Tucume, Huaca de la luna, Tumba de Sican - none on the T-list.
Pachacamac, Chinchorro and Atacama are all on the current T-lists (Peru, Chile, Chile).
The Palaeoindian culture is only represented in Sierro de Capivara (Brazil) and Cueva de las Manos (Argentina). The major Monte Verde is on the Chilean T-list.
In order to close up this gap multiple nominations would be necessary. Ciudad Perdida, Guyalbo, Kuhikugu, Caguana, Ingapirca, Chapaq Nan, Sacred Valley, Otuzco, Tucume, Titicaca, Huaca de la Luna, Monte Verde, San Pedro de Atacama, Kuelap and some more minor sites would be necessary.