Just announced on Darthhater.com, but head on over to this:
http://www.swtor.com/rothc?intcmp=sor_bwa-mkt-t-us-hp-013
if you want to see the details.

This is the first expansion for SWTOR, and it carries with it quite a deal:

As a subscriber you get 50% off the price, (comes out to 10$) and 5 days early access if you pre-order before Jan. 7th. 2013.
It will be released in early spring of 2013, so we don’t have much of a wait.

The story here for those of you who are Story Time with Grokk fans is that the Hutt Cartel has finally made the first move and openly challenged both the Republic AND the Empire for a claim to the Galaxy. With that challenge they release never before seen droids, battle stations and a massive assault.
The expansion also includes not only a raised level cap (55) but also a new planet and a class quests again!

More details will be announced as they go, but for now… JUST ZERG IT.