EA isn’t spilling the beans on release date yet. But if you are to believe Amazon and Best Buy; December 31st, 2011 as the release date for Star Wars: The Old Republic. Mind you, it may well only be the Placeholder release dates.
Though, CVG claims that the game is set for November release, that is in response to EA hinting that the game will be released during Winter Holidays. This is best we know so far about the release date of Star Wars: The Old Republic.
Rest assured, expect holidays to be more Fiesty with Star Wars.