I mean, what provinces are left? Elsweyr is a huge desert filled with scorching, barren badlands, Black Marsh (judging by the Argonian Account) is a disease-ridden swamp, Summerset Isle is all mystical and fancy and snooty, it wouldn't really give that adventure feel. And besides, who actually likes those damn uppity High Elves? >:l Moving on, I don't really know enough about High Rock to get excited for that, but it just sounds boring, so that just leaves Valenwood and Hammerfell. Valenwood WOULD be pretty cool, all lush and tropical and whatnot, but Hammerfell just screams adventure to me. The mental images I get are sparsely populated trade cities, taverns filled with seasoned sailors with many a tale to tell, my character swashbuckling against pirate marauders onboard a ship, etc. <3.<3
Sure, Hammerfell has a fair bit of sand and rock to it, but the lush grassland on the coasts, the architecture, and just the nature of Hammerfell, is enough to make up for all that sand. (:
I dunno, Bethesda always has little hints in their games as to where the next one might be, and I think I've caught some (several people talking about coming to Skyrim from Hammerfell, the Hammerfell Garb I've been rocking for a while now, etc.)!
This is pure speculation, so of course feel free to disagree and tell me where YOU think/would like Elder Scrolls VI to be!.. But I'm pretty sure I'm not the only one craving a pirate adventure. (;