Thought I'd keep this under spoiler tags for those who don't want anything revealed for them without playing the game themselves.
Not much to highlight, just one minor detail that doesn't seem to have been discussed in here yet.
- Companions (Fighters' Guild), Thieves' Guild, Dark Brotherhood and College of Winterhold (Mages' Guild) being the 4 major guilds every "hardcore/diehard" player of ES III: Morrowind or ES IV: Oblivion knows existed in previous games, will be returning.
Also, all achievements (source is linked, just click the green text, and you'll know it's legit. ):
Elder Scrolls V: Skyrim Achievements