Marriott MegaBonus returns for the Fall: Earn Free Nights or Bonus Points on your Marriott stays

Although Marriott's last promotion was called 'Unexpected Bonus' it was no different than past MegaBonus promotions from Marriott and now the hotel chain returns to the MegaBonus nomenclature for the fall. As is the case with this promotion there are several different offers out there and you won't know which one you qualify for until you register. Here is the offer as it will appear on FFBs Marriott page late today with the variety of bonuses that we are aware of (Thanks to Flyertalk!)

Marriott MegaBonus: Earn Free Nights or Bonus Rewards Points for stays at any participating Marriott Hotel Worldwide. Full Details, Online Registration and Booking Register by Nov 15 for stays between Sep 15, 2013 and Jan 15, 2014
Some of the Offer Variations:
- Earn one free night certificate for a category 1 to 5 hotel after every two stays. Maximum of 2 free nights.
- Earn 35,000 points after 20 nights and another 15,000 bonus points after 25 nights - up to 50,000 points
- Earn 25,000 points after 15 nights and another 15,000 bonus points after 20 nights —up to 40,000 bonus points
- Earn 25,000 points after 12 nights and another 15,000 points after 18 nights —up to 40,000 bonus points