It's TIER.
Tiered benefits is basically a way of having different benefits or perks, based on various levels of participation, in
DVC's case it would be ownership, or number of points. Multiple companies use tiered benefits for their loyalty programs, such as Hilton, Marriott, Delta, American Airlines, etc, etc. In the Hilton case, their program has different levels based on the number of nights stayed per year - Silver, Gold, Diamond, Platinum, to name a few. The more you stay, the better the perks or incentives get.
I travel a lot for work, but am not always exclusive to a particular progam as some people are. Perhaps it isn't the best strategy, but it is the way that I do it and have certainly enjoyed plenty of "freebies" through the years since I prefer to live within my departement's annual budget and get the customary "gold star" (i.e. bonus) at the end of the year - so I have multiple memberships and use them all since I like to get the best price/deal to live within my alotted budget - somtimes the cheapest in my price range other times not but always offering as many/similar amenities will be from the other available hotels near where I need to be such as Marriott's program, Holiday Inn's, etc... (I'm a member of each). A co-worker I frequently travel with is
exclusive to the Hilton program and only stays at their properties, regardless of price - he just uses his budget differently and frequently goes over budget... and consequently doesn't always get the "gold star" at the end of the year but he racks up a bunch of their points to use for rewards of his choosing. But I digress... when we travel together and he's the one to make the reservations for both of us - I know it'll always be a Hilton branded hotel. Upon check-in, he's a Diamond while I'm a Gold, so he gets more "stuff" than I do (he also accumulates more points per stay than I do too).
At this point anything you read on here about a Tiered Benefits program for DVC is purely rumor, heresay, or imagined as nothing has truly been announced or rolled out by the company. Sure it is seeming to be highly likely that something will be announced, but until such time, anything regarding what those benefits might be, could be, or even will be - is just speculation. At this point nobody truly knows what kind of program DVC could be dreaming up.