It occurred to me after just posting in the related Marriott forum thread that you Starwood TUGgers might have some answers. (DOH! Not exactly a lightbulb moment.

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With so many moving parts it's difficult to try to figure out how at the end of all the machinations the customer loyalty program - Marriott Rewards - will work, especially as to the affiliations between what will then be two timeshare companies separate from each other and separate from the hotel company which will administer the loyalty program, Marriott Int'l.
First is the re-naming of Starwood's timeshare division, SVO, to Vistana Signature Experiences. Then - or in conjunction with? - is the spin-off of VSE to a subsidiary company of Interval Leisure Group. Then is MI's acquisition of Starwood Hotels et al business. All of the press releases indicate that at this point it's only the first step that's expected to be completed 4th QTR '15, the second by 2nd QTR '16, and then the last is contingent on the second being completed. IMO it's kind of odd that no impediments to any of the processes have been theorized on TUG ...
So at this point, are you SVN/VSE owners seeing any indication that the first is complete? Other than the notices announcing the upcoming changes, have your official notices relative to your ownerships (emails, reservation and other transaction confirmations, etc) begun referencing the VSE name yet? Any changes to your online owner account portals?