Agreed, same amount and it is more correct that they exchanged Hot Stage (outdoor) with Ship Stage (outdoor). So they kept the former Heat Garage, now Hot Stage, but got rid of the Enjoy Stadium.
Dream Stage is just the former My Navi Stage, it seems. Don't you agree? But I can see no way that they can join Enjoy Stadium and Doll Factory. Both were seperate halls, each of them only accessible by a door. So unless they didn't removed the walls entirely, I doubt it being better in any way.
With that AKB thingy tickets should soon be sold out, I assume. I wonder if that has impact on spontaneous buyers.