Won't ever happen. Applications written for iPhone can't run on Android, and the latest version of the iPhone SDK developer agreement essentially prohibits developers from writing cross-platform apps or porting apps from other platforms to iPhone easily.
http://forums.Groundspeak.com/GC/index.php?showtopic=239192
"An Android Geocaching app" is very different from "the iPhone Geocaching app on Android." The exact same app will not appear on both devices.
Obviously it won't be an iPhone app. But if they start with the iPhone apps features as requirements for the Android app, and utilize many of the elements of the UI, then I'd consider it a port. Changes will be necessary, obviously.