The developers seem intelligent enough to make a good game, their stuido head posting the reasons WoW dominates its genre on gamesutra; so there is less of a chance that it will be fail like Vanguard or Age of Conan.
Bounty Hunters, Smugglers, Jedi, and Sith are the confirmed classes so far.
Companion system- Intractable side-kicks, slaves, mercenaries, droids, lovers, friends,etc.
Unique Missions sets for all classes.
Choice- Dialogue options allowing players to what their characters do and how they act. This alters NPC opinions of your character, for example closing off options and missions if your character is too impulsive or gaining them if they are known for being pragmatic.
Morality System: Choices push you towards the light or dark side.
Encase anyone is interest in it here is a link to their website.
http://www.swtor.com/info
http://www.swtor.com/community/forumdisplay.php?s=015b752f49925eb6b0cbfd7f81ceca70&f=4
Storyline
http://www.swtor.com/info/timeline/timeline1