Google Maps for iOS may have not been submitted to Apple... yet
Rumor has it that Google Maps for iOS is already being reviewed by Apple, suggesting that the app might become available for download sooner than we expect it to. That is great news for many who have experienced using Cupertino's own Maps application, which, as users have discovered, isn't quite perfect yet. However, others claim that the rumor is false. In particular, here is what the well-informed Jim Dalrymple for The Loop had to say regarding the Google Maps app submission: "Nope".
Google Maps for iOS may have not been submitted to Apple yet
The reason why many iPhone and iPad owners are now hoping for Google to bring back its Maps app on iOS is that Apple's own mapping application is not as reliable. Numerous users have reported incorrectly labeled businesses, places of interest, and even some smaller cities are not located where they are supposed to be. Apple has already commented on the matter and promised that the user experience will be improved.
source: The Loop via Apple Insider
Things that are NOT allowed: