Just got an email from Starwoods about this:
https://www.spgpromos.com/moreforyou/EARN UP TO TRIPLE STARPOINTS WITH SPG MORE FOR YOU.
Make your weekend stays count with even more Starpoints®. Register for the SPG® More For You promotion to earn:
Double Starpoints on stays of two or more eligible nights
Triple Starpoints on eligible stays that include a Friday or Saturday night (Thursday or Friday night in the Middle East)
Register by October 31, 2014, and start earning more at over 1,000 participating Starwood hotels and resorts for stays from September 15 through December 15, 2014. Isn’t more amazing?
Not all locations participating.
These are excluded.