So your going to release all the android zones 1 by 1 or 2 by 2 every 2 months or so? Then your going to release it on iOS? Thats about 6 months from now before iOS is fully released. Kinda screwing over everyone on iOS, who without them you wouldn't even be on android in the first place.
Zones are implemented but need final passes to ensure that they're optimized and polished. For example both Shalemont and Stonevale were polished and optimized in just under two weeks not months. Also the zones don't need to be reworked for iOS- once they are working in the new engine they will work on both Android and iOS.
We are not prioritizing Android over iOS, we are working on getting the engine out to everyone as quickly as possible.