They will charge what the market will bear...
With its premium location and flagship status reputation, buyers may be willing to pay more for GFV than for Riviera..
Being larger than most on-property studios including existing GFV studios, buyers may be willing to pay more..
Being done "on the cheap" without kitchen sinks, and limited to just studios, buyers may be willing to pay less.
My guess -- They start pricing pretty high. But they will adjust incentives based on demand. After incentives, I'd guess slightly higher than Riviera.
On resale restrictions.... I'm a lawyer but not a FL timeshare lawyer. I strongly suspect it is possible for Disney to put in re-sale restrictions but it may require some contractual gymnastics. Depending on the ease or difficulty of those gymnastics, we may or may not see the re-sale restrictions. I'm sure Disney would want to include the resale restrictions, but it may (or may not) be too complicated to do so in an existing condo association.