First Look if you don't count the Trailer I suppose. We have screen caps to offer a better look at the new DLC.
Source: Bethesda Blog
Explore Beyond Skyrim
Leave the province of Skyrim and travel to the coastal island of Solstheim. Encounter the Dark Elven settlers of Raven Rock and the native Skaal, as you unravel the mystery of a Dragonborn’s return.
Become the Ultimate Dragonborn
Harness the power of the Voice as you face off against the first Dragonborn. Wield new shouts and spells including Dragon Aspect – allowing you to summon the inner power of a dragon to deliver colossal blows and strengthen other shouts.
Discover dark powers as you journey into a new Daedric realm. Collect books of forbidden knowledge and choose new paths for your skills and abilities.
New dungeons, creatures, weapons, and more
Suit up in Bonemold and Chitin armors and wield Stalhrim weapons as you navigate through a myriad of dungeons. Battle formidable foes like Ash Spawn, Rieklings, and more.
If you haven't seen the trailer yet, check it out (with screenshots) here: