I think Dragon Age 3 has a very interesting trailer. The Witcher 3's trailer was very boring by comparison, but was more in-game.
I fully believe Bioware is able to deliver on their promises. Functionally capable, anyway. Why they choose not to is beyond me and I'm still wary from the gross misrepresentation of Mass Effect 3's ending. There's no trust there.
I doubt The Witcher will be the ultimate RPG or anything like that. I sometimes struggle to see it as an RPG at all. But it will be a solid title from capable hands that know what their audience is looking for (sex, violence, choice, moral complexity) and advance themselves with each installment.