According to the missive on the MAG site detailing this weekend's operations, the promotion is currently underway and will last until 11:59PM PT Sunday night. Veterans who already have an XP bonus need not worry: this stacks on top of their current modifier. Also, a word of caution: make sure you complete every match, because the modifier isn't applied until the end. We wouldn't want you evacuating the battlefield, leaving all of those delicious points behind.
So ... what are you still reading this for? Go get yourself some points! For S.V.E.R.!