I got an email with the following:
Enjoy this cardmember exclusive: Get 10% of your redeemed points back!
Register today then redeem your points between August 1 and September 30, 2018.
Redeem your points for free nights, Points + Cash stays, room upgrades, or dining and spa services completed between August 1 and September 30, 2018. You'll get 10% of your redeemed points back as Bonus Points. They'll automatically be deposited into your World of Hyatt account after your points have been used.