The horrendous use of "2morrow" might be a clue and not just Internet-speak. Besides, there was plenty of room left in that 140 character-limited tweet. With Mass Effect ready to move on to number 3, that leaves Dragon Age ready for number 2.
Further backing up a major announcement, though completely speculation on my part at this time, is the fact that Game Informer is scheduled to reveal a cover tomorrow.
Shacknews will update you on both BioWare's announcement and Game Informer's cover tomorrow. Who knows, maybe we'll only have to write one story.
Hooray! This means cheaper Dragon Age 1 when I finally finish off my back catalog and can play this fucking thing.