Star Wars: The Old Republic was mentioned during EA's financial call today, during which the publisher gave an updated subscription count of roughly 1.3 million and hinted at more content on the way.
The 1.3 million subscriber base is slightly but notably lower than the 1.7 million reported in February. The game was released first to North America and Europe on December 20, 2011, meaning this collaborative MMO between EA, LucasArts, and BioWare Austin has seen roughly five months of fairly steady activity. Of course, active subscriptions don't necessarily mean active players.
As for the new content packs, BioWare Austin has two more planned, though no release times or other details were specified. We do know, however, that the packs have been dubbed "Legacy" and "Allies," though these are likely just placeholders rather than final names. The long-awaited 1.2 update that debuted last month SWTOR's largest to date, introducing a new instances, Warzone, and Legacy content.