A number of people have reported Guides telling them the pool hopping would not be permitted at SSR.
That unconfirmed information notwithstanding, I think there are a couple of factors that weigh against it.
1) When fully developed, SSR will have over 1100 bedrooms. Neighbor OKW has another 900-1000 bedrooms. When at or near capacity, that's an awful lot of resort guests within a short boat ride of High Rock Spring.
2) Proximity to Downtown Disney. What sort of extraordinary measures would they have to implement in order to allow legitimate
DVC pool hopping, while keeping DD patrons and DD resort guests from joining the party?
Since it will take a couple of years for the resort to be fully developed--and much longer for all of the points to be sold, perhaps they will allow pool hopping from Day One and take a wait-and-see approach.
I have no real preference either way. We're all one big, happy DVC family, right?

As long as High Rock Spring doesn't consistently have over-crowding issues, let people from OKW (or any other DVC resort) make the trek over if they so desire.