Wyndham Rewards: Double Points starting with your second stay

It has been some time since we last saw a systemwide Wyndham Rewards promotion
but there is one now as of today! The offer is similar to IHG Rewards Club current offer. 
Here is the offer as it will appear on RC’s Wyndham  page later today (or Monday):

Double Wyndham Rewards Points starting with your second stay at participating Wyndham Hotels Worldwide. Valid for up to four (4) separate qualified stays (for the second, third, fourth,
and fifth qualified stays)  Register Online (Registration is required) Register and book by Sep 13 for stays until Sep 20, 13