UPDATE: If the offer didn't unlock for you, try to go into where it says Special Offers. It's right next to where it says My Account. Thanks to Kristin for the tip.
Here are the various offers that will be available:
December 9th – $50 Southwest Airlines gift card only 1,200 points (limit 1)
December 10th – $50 Bass Pro Shops gift card only 1,200 points (limit 1)
December 12th – FREE 12-pack Coke coupon only 30 points (limit 4)