At last, some science fiction to go along with all the action-adventure and war movie stuff.
We see Ellen's POV as she emerges through the light symbols of the Cylons into a goo tank where she wakes up (a Centurion takes note) and a blurry POV shot (probably Anders as he wakes up in sickbay) of Tigh and a bug-eyed Kara.
We're going to get answers finally I guess. She draws Tigh's picture, we see the other Final Fivers and the rebel Hybrid. And we see a Cylon fleet complete with Resurrection Ship.
Later in the clip Ellen stands over something (unseen) that sparks or flares [perhaps the barrel-fire in the underground bunker on New Caprica - after she had been poisoned and wakes up], and the very end of the clip may allude to the Ship of Lights.
As usual the Canadian Space promo is much more interesting than the US SciFi promo:
We see Sam looking all Man Who Fell to Earth from a flashback or before brain surgery; Ellen saying "I'd do it all again"; the sea where Saul and Ellen died when it was a bank; Kobol ruins; supernova on the algae planet; Sam during the resistance on Caprica; the Centurion walking Ellen(?) down the hall (some woman, wearing a knee-length black dress or robe) of a Base Ship (or perhaps it's Roslin to the room with Ellen if the awakening happened on the rebel Base Ship); Adama and Tyrol noticing the Galactica is falling apart; a rectangular doorway with light spilling out; Sam telling Kara to get the other Fivers because he remembers "everything." [Unless PC guest-star-brain-specialist provides yet another countdown clock device - he has to go into surgery now! and the tell-all is aborted] Overall, No Exit looks terrific.