Those who purchase Gears of War: Judgment will score a copy of the original Gears of War gratis, this much we know; however, Walmart is further sweetening the deal for those who pre-order through the retailer by offering Gears of War 2 or Gears of War 3 free as well.
If you're on the fence, a public demo of the new OverRun mode will be made available to Xbox Live Gold subscribers on March 19, but that just so happens to also be the launch date for Gears of War: Judgment – so that won't be much help for your decision. If you want to score the additional two free games and included Classic Hammerburst skin from Walmart, you're going to have to pre-order before then.