Here's my guess, SPG properties currently priced more than 85k MR (standard cost for cat 8 starting in Aug) will only be redeemable using points plus cash. Marriott will do this by either blocking availability on standard rooms which leaves you with nonstandard room or suites that can only be redeemed with additional cash, or they can create a list of high-end properties exempted from standard room redemption. I think it's safe to assume that StR Volmulli, W Maldives, Prince de Galles, and the likes will be assigned to cat 8. But since standard rooms will be blocked, you can only redeem nonstandard or suites using 70-100k points plus cash.