Prepurchase one of the following games, and you'll get a voucher for 35% off of a future title. Games listed are Aliens:Colonial Marines, Bioshock Infinite, Dead Island Riptide, Metro: Last Light, Tomb Raider, Dead Space 3 LE, Company of Heroes 2, Sniper Ghost Warrior 2, Crysis 3, Simcity LE, and South Park: The Stick of Truth.
The voucher is tied to your account and expires 21 days after receipt. No word on how long the deal is live, however. If there are 2 games that you've been wanting on PC, this might be a good time to preorder it.
Edit: And I picked up Stick of Truth(with Blands 2 Season Pass thrown in). Now, I'm just trying to decide if I should use it to prepurchase Bioshock Infinite and see if I get another coupon.
Edit Part 2: And it wouldn't let me stack the 35%. Oh well, I can wait until they have their next sale as it will probably be happening within the next few weeks.