Yes, just to confirm, my current plan is for nothing to change for iOS users. You install the game, login via GC, and play. In the less common event that you wish to play on both iOS and Android, you'll be required to convert that account to a slightly different one. It'll be the same username, but will most likely require a password and email. At which point, it'll function the same as before, it's just you now have an account password to keep track of in case of new devices, re-installs, etc.
So to answer your question specifically:
Yes, that is the current plan.