So, to no one's surprise, Makeb (AKA Rise of the Hutt Cartel, chapter 4) is finally official:
http://www.swtor.com/buy. Coming sometime in the new year. Also to no one's suprise, it ain't free. $10 for subscribers (the price everyone's always expected), $20 for non subscribers. Level cap going to 55, which likely means Makeb is freaking enormous.