I'm copying the following from a recent post in the Timeshare User Group forum (TUG.)

It will be of interest to anyone who owns any Marriott Vacation Club timeshare weeks.


Please know that as of July 1, 2008, one elite night credit is earned
for each night stayed during your designated ownership week. In
addition to getting Elite night credit for your ownership stays,
beginning August 1st, Elite members now receive benefits when staying at
MVCI properties. You receive a 10% discount at the Marketplace, bonus
points for incidental charges, and Platinum members receive 500 points
as a Platinum arrival gift.

We are pleased that Marriott Rewards is now offering this for MarriottVacation Club International owners.