I'd probably have to change mine to Alinor/High Rock/Morrowind.
I'm rather conflicted on some, though. I love Cyrodiil for its Ayleidic ruins and such but it was unfairly treated in Oblivion.
Valenwood has the chance to be extremely interesting or extremely boring. It all depends if Bethesda wants to make it a stereotypical tree-dwelling elf home or a dangerous but lush and beautiful jungle* full of ancient secrets and ruins.
*not necessarily a tropical jungle like Earth's, but perhaps something similar
Black Marsh lore-wise. Skyrim play-wise.
CYRODIIL COME