Essentially this means Europe will still have a major advantage in submitting more than 1 nomination per year. For example, Germany can reasonably submit 3 nominations: Hydraulic Engineering and Hydropower - Augsburg (Germany) and Mining Cultural Landscape Erzgebirge/Krušnohoří (Germany, Czechia) and Great Spas of Europe (Austria, Belgium, Czechia, France, Germany, Italy, UK), as long as Czechia and other nations come to "a common understanding" that the later nomination falls within their annual limit.
As winterkjm correctly points out, the exception of transnational nominations to the one nomination per state party per year will undoubtedly benefit Europe.
Nonetheless, this could also encourage non-European countries to initiate transnational nominations, as recently happened with Quapaq Nan and the Silk Roads nominations.
Currently, the great majority of transnational TWHS are in Europe. Most non-European countries do not have any transnational TWHS on their T-list. However, we might see this changing in the coming years. Winterkjm additionally convincingly argues that favourable historical, political and geographic conditions facilitate WHS cooperation in Europe compared with other parts of the world.
I would be interested to know what other forum members think of the potential of such nominations in other continents. Theoretically, natural sites should not be bound to political boundaries, yet which ideas would you bring forward? The same is true of cultural sites.
1) Bering land bridge (Russia, USA) - Durian has just mentioned a IUCN report on the site, sounds fascinating.
2) Sites of polynesian expansion (an Icomos report found Polynesian agricultural practices not to be represented)
3) Mexico-USA deserts (mostly Chihuahuan Desert)
4) Andaman Sea (Myanmar, Thailand, India) - mentioned by IUCN
5) Benguela Current (an ongoing intiative involving Angola, Namibia and South Africa)
6) Hijaz Railway (Syria, Jordan, Saudi Arabia) - The idea has already been discussed in the Forum (Solivagant)
7) Several new Silk Routes intiatives