Unfortunately it’s largely out of the hands of CA, porting is hard work.
The way 1.6 released, you should think of it as releasing early on PC as opposed to late on other platforms, the way CA handled this update was by having it be an open beta, letting the players test the (very very very buggy) update. That way he could change it accordingly and roll out an abundance of patches.
This works well for consoles as they prefer a game releasing with large flushed out updates and big patches instead of a bug ridden first release. Mobile takes time because of all the interface and control changes, it’s almost guaranteed it won’t take as long as last time either, that was a fluke due to the original porters not completing their job.