I am thinking of getting an iPad— so should I wait until September? Will the price be the same? I will want it for productivity.
It won't matter... the upgrades will be free, because they are in the software.
The apps will cost what they will cost.
I do not foresee a bump in iPad models yet. Nor do I foresee a change in pricing. Apple can sell every iPad they make right now at the current price points and they have many more markets in which to release at these price points.