Personally, I don't see how the next game could take place anywhere but the Summerset Isles. Considering that the Thalmor/Second Aldmeri Dominion has run amok the past 200 years (with the great war, white-gold concordat, and such) as well as the internal cultural uprising Summerset seems to be facing, Bethesda seems (to my giddy imagination) to be spoon feeding those mythic and enigmatic islands to us as the next title. But, hey, being wrong is something I have a knack for, please let me know your thoughts. Still working on a title and plot for Summerset on my end, I'll fill you in when I have ideas.
Please reply and share your thoughts.