If you liked Oblivion or Morrowind I'd
strongly suggest playing Two Worlds 2, I heard the first game was horrible so my hopes weren't big for it, but it surprized the hell out of me. It's amazing, the environments are incredible, it has jungle, waist high grass and plants that move and bend when you run through them, the sun is insanely nice, you can sneak through the grass and backstab stuff, the water is wonderful with fish in it, tons of quests too. You can buy houses and even sail a sailboat (not that I've actually managed to sail mine yet, there's never good wind when I try :/), anyway definitely give it a try!
Here are some of the games I'll buy once they come out to hold me over until Skyrim (after I beat TW2) and after it comes out:
Dragon Age 2
Deus Ex: Human Revolution
The Witcher 2: Assassin of Kings
Crysis 2
Warhammer 40,000: Dawn of War 2: Retribution
Dungeon Siege 3
Warhammer 40,000: Space Marine
Red Faction: Armageddon
Diablo 3
Total War: Shogun 2
Hope this helps!