Apparently, it's 50 bucks, and gives access to all DLC. Interesting quote from Joystiq, however:
That, however, is where the "interesting" part of this ends, and the "pretty gross" part begins. Beyond the DLC access, Premium members are said to get "access to powerful new features." What features might those be? "The ability to reset stats" is listed, but so is "queue priority into servers," which means exactly what it sounds like. As in, "pay for this service and get into servers faster than the rabble."
If this is true about the priority access, then we fucking called it 2 weeks ago. I'm about fucking done with EA. What a bunch of bullshit if true.
EDIT: Just saw this gem below: "Membership includes all 5 themed expansion packs for Battlefield 3 - including two week's early access." Fuck EA straight in the ass. They may have an even more onerous deal than Elite.
Leaked info below: