A reliable Dragon Age blogger by the name of Lady Insanity has been live tweeting from the PAX East Dragon Age panel, which took place earlier today. By the far the most prominent news she provided was confirmation that Cassandra Pentaghast and Cullen would be romanceable in the game (though Cullen's status as a companion remains unclear).
Lady Insanity also reported that BioWare developers (among them Creative Director Mike Laidlaw) had stated that there is a "solid possibility" The Warden and Hawke would appear in Dragon Age: Inquisition, while Flemeth will also "probably show up."
Lady Insanity's twitter feed can be found here. Though she is highly reliable as a blogger, this post will be updated when official confirmation emerges from BioWare.