This thread is the opposite of the Confirmed Features thread, everything in the list down below are speculations, no fact. So I'll be making a list of the features that we ASSUME are in, followed by those categories:
Character -
- Possible head bobbing while sprinting, due to the head-bobbing animations at the beginning of the trailer.
NPC and Interaction -
Combat -
- Seperate Pauldorns, based on screenshots and the trailer.
- Volkihar (the Nordic vampires that live under the ice in frozen lakes and can grab you down through the ice). Because we're in Skyrim.
Player Skills and Leveling -
- Possible social-skills (like Cooking, Wood-cutting, Mining, Smithing) mini-game, based on http://www.youtube.com/watch?v=D-2_FNvarQE 1:50.
Interface -
World -
- Mounts, based on the fact that we've seen a horse in the trailer.
- High-res textures for the PC.
- Nirnroots are back, based on the trailer's gameplay footage.
- Two joinable magic factions. Because we know the Mage's guild has split into The Synod and the whatchamasomething of Whispers. Or it could simply be a repeat of the "Fighter's Guild/Blackwood Company" scenario.
Feel free to add to this list by commenting... I can't remember anything...
When commenting to add a feature, write down the assumption and what it's based on.