I believe Bethesda's current strategy for choosing settings for TES games is based in part on how feasible it is to bring the setting to life on the platform(s) they intend to release a game. For example it would be difficult to do any justice to the migrating tree cities in Valenwood on a game console that doesn't have enough power to simulate something of that scale without sacrficing the visual quality, scope of the game or otherwise diminish the open-world model. Oblivion showed us what we could expect from a game set in Summerset Isle as far as architecture is concerned so unless a future Skyrim expansion introduces a new hook that would make the High Elf homeland a more dynamic setting than current lore suggests; I think it unlikely that the next game will take place there. Highrock and Orsinium have also been exhaustively explored as settings in TES II; making those unlikely candidates. Assuming they don't return to Cyrodiil or Morrowind; that leaves us with Hammerfell, Elsweyr and Black Marsh?

Well duhh, elsweyr, Jungle,desert,moonsugar,skooma and last but not least khajjit!

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