Bioware can be troll-y. But they also love their fans. So I say, welcome them with open arms but keep one eye on them. (At EA play.)
They love their fans? You can say that with a straight face, here? In this forum aka The Cave Of The Lost, Forgotten and Forsaken? Hah.
BioWare loves paying customers and adoring worshippers. A fan who dares to say something like, "I liked your game but the ending was disappointing and not at all what you implied we'd get" is being shouted down, ridiculed and then ignored. BioWare has allergic reactions to critique.
But since they care about dazzling the naive with flashy trailers to create hype (and eventually revenue) for their (lately mediocre) games, we can probably expect a second trailer that mentions the story and/or perhaps tells us a little about our character. A few minutes of (alpha) gameplay footage will follow. Of course, this might show things again that won't actually be in the game because they ran into hardware limitations or time constraints.