One thing that disappointed me at first was the fact we won't be able to choose the attributes we want to improve. But GCD mod from Morrowind did exactly this, and I enjoyed playing with it, so it's cool
Bethesda finally changed that attribute system, no more efficient leveling :foodndrink:
Another thing was fast travel, I just hope someone makes a mod like CTN for Oblivion ASAP
The most scary thing I saw was action game features, in the combat system. So many things to do, this isn't an RPG-type combat system for sure. This is exactly like WoW is (except there it's the number of skills) and I hated WoW. I like games that require skill, like online FPSs, but not so much in an RPG. Every RPG I liked didn't have such an action-game system.
Another scary thing was that monsters and enemies will be adjusted to your level and skills (I think that was what I read, can anyone confirm?). If it's not well implemented, I expect an Oblivion-type level scaling.
Then there were other things I liked very much, like the improved radiant AI, duels, more random NPC behaviour, etc...
Cooking/farming/mining/woodcutting/blacksmithing I liked very much too of course :foodndrink:
No info about factions and the longevility, that's a shame.