EA has revealed that the limited edition of Visceral Games' Army of Two: The Devil's Cartel will give you the TAH-9 handgun. According to EA, the TAH-9 handgun is the only fully-automatic handgun in the game. You can use it to lay down "legit" firepower while your partner flanks the ruthless cartel.
Speaking of which, they've also released a trailer where they compare the standard handgun to the TAH-9, and it's quite funny to see it side-by-side.
If you're familiar with EA, these "limited editions" are just the first-run of the games and not really that limited. Nevertheless, they're called limited editions and that's what we're calling 'em.
Will this handgun be available in multiplayer, too? We don't know at this point as the trailer doesn't exactly say, but if you want to get it regardless, best to pre-order the game now.
Army of Two: The Devil's Cartel is being developed by Visceral Games (Dead Space) and is scheduled for a March, 2013 release for the PC, Xbox 360 and PS3.