Alpes de la Méditerranée
https://tribuca.net/detente_70275858-dossier-35-classement-unesco-cap-sur-2021-pour-le-mercantour

ICOMOS finished Jomon Sites Visit

The report said the evaluation done by an Australian expert.

https://news.yahoo.co.jp/articles/2ce5ff8ef571e3222cf1f1fc153cd5a441819fcb

Iranian Rail ICOMOS review

ICOMOS will start review Iranian Rail in late September or early October

https://ifpnews.com/icomos-to-assess-irans-rail-corridor-for-recognition-as-industrial-heritage

Unfortunate news from Chad. All but guarantees the transnational (Cameroon / Chad / Niger / Nigeria) "Lake Chad Cultural Landscape" nomination will be postponed/delayed.

https://www.theguardian.com/world/2020/sep/24/chad-halts-lake-world-heritage-status-request-over-oil-exploration-unesco

September 23-25 "The inspection days went well and the whole city contributed to creating a great synergy to best present the candidacy that belongs to everyone.

https://gazzettadibologna.it/primo-piano/portici-di-bologna-patrimonio-unesco-conclusa-lispezione-dellispettore-poison/

We previously had confirmed these 19 nominations for 2021. Based on what Jonathanfr posted, we know the final number is 22 total nominations. We did not have information on 3 natural nominations. I suppose it might take some digging and time before we know which natural nominations were submitted.

We can start the deduction with the assumption that those 3 are from different countries than those that have already nominated a cultural site for 2021 (as only 1 nomination is allowed).

From the ones I had on the 2021 page, these could be:
Hin Nam (Laos) (extension to Phong Nha Ke Bang)
Mountain Ecosystems of Koytendag (Turkmenistan) (deferred a few years ago but still active)
Mt. Mantalingahan Protected Landscape (Philippines)
Ivindo (Gabon)

IUCN has posted nominations for 2021

https://www.iucn.org/theme/world-heritage/our-work/advisor-world-heritage/nominations

For the 2020-2021 cycle, IUCN is evaluating the nominations below

Lake Chad Cultural Landscape (mixed site) Cameroon / Chad / Niger / Nigeria
Ivindo National Park Gabon
Badain Jaran Desert - Towers of Sand and Lakes China
Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe (extension) Bosnia and Herzegovina / Czech Republic / France / Italy / Montenegro / North Macedonia / Poland / Serbia / Slovakia / Switzerland

To get to 22, we're still one cultural site short?

We had 19 above, plus now Ivindo and the Beech Forests extension.

Maybe a Referral from 2019 (Danube Limes)?

Well, according to this https://gdansk.naszemiasto.pl/stocznia-gdanska-z-szansa-dolaczenia-do-ikon-kulturowego/ar/c1-8000569 and to this https://www.dropbox.com/sh/f60vo7y3kd1cjf8/AABh0QRuA8C-_Bww4mRI_kNWa?dl=0 it could seem that Gdańsk Shipyard is the missing one...

Yes you are right!
It also has been added to the management summaries in https://www.dropbox.com/sh/f60vo7y3kd1cjf8/AABh0QRuA8C-_Bww4mRI_kNWa?dl=0

Official Nominations for 2021

Africa (3)
Cameroon / Chad / Niger / Nigeria - Lake Chad Cultural Landscape
Cote d'Ivoire - North Ivorian Sudanese Style Mosques
Gabon - Ivindo National Park

Arab States (2)
Egypt - The Coptic Monasteries of Wadi al-Natrun
Jordan - As-Salt The Place of Tolerance and Urban Hospitality

Asia and Pacific (4)
China - Badain Jaran Desert - Towers of Sand and Lakes
India - Dholavira: A Harappan City
Iran - Cultural Landscape of Hawraman/Uramanat
Japan - Jomon Prehistoric Sites in Northern Japan

Europe (9 + 2 Extensions)
France - Nice, capital of tourism in the Riviera
Germany - ShUM Sites of Speyer, Worms and Mainz
Italy - The Porticoes of Bologna
Latvia - Grobina archaeological ensemble
Poland - Gdańsk Shipyard
Russia - Petroglyphs of the Lake Onega and the White Sea
Slovenia - Ljubljana: The Timeless, Human Capital Designed by Jože Plečnik
Spain - Ribeira Sacra
UK - The Slate Landscape of Northwest Wales

[Extension] Bosnia and Herzegovina / Czech Republic / France / Italy / Montenegro / North Macedonia / Poland / Serbia / Slovakia / Switzerland - Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe

[Extension] Germany / Netherlands - Frontiers of the Roman Empire – The Lower German Limes

Latin America and Caribbean (1 + 1 Extension)
Chile - Settlement and Artificial Mummification of the Chinchorro Culture in the Arica and Parinacota Region

[Extension] Mexico - Franciscan Ensemble of the Monastery and Cathedral of Our Lady of the Assumption of Tlaxcala

March 29, the exact dates and modalities of the extended 44th session the World Heritage Committee will be determined.
http://whc.unesco.org/en/sessions/15EXTCOM/

Update for Porticoes of Bologna:
http://www.comune.bologna.it/news/candidatura-portici-unesco-nuovi-tratti

Following the inspection by ICOMOS in September 2020, the proposal of the Porticoes of Bologna was extended to include additional locations, among them the entire Piazza Maggiore.
This seems also to indicate that ICOMOS would recommend inscription.