EA just held their quarterly earnings call and released some juicy factoids about TOR's launch during it. Specifically, over 2 million copies of the game has been sold and 85% of players have subscribed or are still in their trial period (for a total of 1.7 million "active subscribers"). And those gamers are getting their money's worth: the average session time in the first month was FOUR HOURS, and over 1 million players were logged in simultaneously at one point.
In the Q&A portion, EA addressed concerns about the game's profitability by saying, "At 500,000 subscribers, we'd break even. At a million, we'd be making a profit but nothing worth writing home about. As it scales up from there, we're talking about a nice profit. At this point with the successful launch, we can take the worst case scenarios off the table."
You can read more long-form quotes