Bixyl Shuftan, everyone's favorite roving furry reporter in Second Life, has an update on the prim boost owners of private regions will soon get, as presented by Linden Lab staff with that slide above. Interestingly, there's also an option to get an even greater prim allowance for an extra charge:
For Private Estates however, the change would not come right away but "within a couple months, could be sooner, hopefully not later." Patch [Linden] also mentioned that eventually full Private sims would have the option for even greater capacity, but for a price. They could have their prim allowance boosted to 30,000, but only if a $30 fee was paid up front and a monthly $30 fee charged in addition to the usual monthly tier.