Electronic Arts made public the number of active subscribers for SW: TOR. Subscription numbers have tanked by 400,000 since February, when the number was at 1.7 million. 1.3 million subscribers is still a respectable number and nothing to scoff at, but considering that the game only launched in January, this doesn't bode well.
Part of SW: TOR's draw is also its bane. Having fully-voiced content and deep storytelling in a MMO is difficult to continue churning, especially at a rate that would upkeep player interest.