The Star Wars: The Old Republic site has been updated with new information about all of the digital preorder bonuses players will score on release of the game.
All pre-order players will receive a color stone that can be applied to lightsabres, blades or blasters. Those who preorder the digital deluxe edition will score a flare gun, a droid training dummy, a holodancer, a holocam and a STAP (single trooper aerial platform), a vehicle that will be accessible once players gain the ability to pilot vehicles.
Lastly, folks purchasing the collector's edition will get all of the above plus a mouse droid pet and will have access to a special collector's edition store that will feature social items for yourself, and unique appearances for your companion. The store will also have regular updates to give players incentive to keep coming back.
The SWTOR team has produced a handy dandy video you can check out on the Star Wars: The Old Republic site.