Outside of World PvP, the major announcement for Star Wars: The Old Republic at this year's PAX Prime is a begin date for the highly-anticipated game test weekends.
At the panel, BioWare announced that gamers can expect the game test weekends beginning next weekend, September 2nd.
UPDATE: Also, please keep in mind that pre-ordering the game does NOT affect your chances of getting into the test weekends!
If you haven't signed up for Game Testing just yet, you can do so here.