Now, clearly there might be some extra cost involved because of the traditional 'high season' during the school holidays, but such a large increase and difference in price structure clearly indicates that Universal know when they are expecting WWoHP Phase 2 to open. ;)
You might be interested in that 'spoiler'.
Universal construction is 24/7, which allows a project to be completed roughly 3X faster. I was watching the welder's torches glow from our hotel room at 3AM one night.