Developer Ben Guild posted images of the alleged replacement app on his blog, claiming that it will come loaded with new features previously available only to Android users.
The source claims that the service has been optimised for the iPhone 5's larger screen, and will support two-finger map rotation and vector-based graphics to cut down on data usage.
Apple replaced Google Maps as the pre-loaded mapping application for its iOS 6 operating system with a first-party service developed in conjunction with TomTom. The service has been widely criticised for the amount of inaccuracies reported.
Google's Eric Schmidt previously downplayed rumours that a new native Google Maps app is in the works for iOS 6 users, but insisted that the internet giant remains hopeful of future collaborations with Apple.
Last week, Apple pulled an unofficial Google Maps application for its App Store without offering any explanation for the move.
Watch Digital Spy's video review of iOS 6 below: