Wikipedia has officially dropped using Google Maps and has moved over to OpenStreetMap for both iOS and Android apps. Moving over to OpenStreetMap has become popular now with many companies and if you could remember, Apple also did the same in their iPhoto app for the iPhone and iPad, and is expected to do so in the next release of iOS, the iOS 6.This might be because of the rate limits that Google has put for the Google Maps API. This is not all, Foursquare and Microsoft has also moved away from the Google Maps towards the OpenStreetMap for various products.
Wikimedia Foundation thinks that this move will enable the app to run on millions of cheap Android handsets across the world, escaping the cost of Google API charges. This move is expected to expand in the upcoming years too. The website using the Google Maps API will be moving towards the OpenStreetMap in future. The new upadte to the app has brought a lot of social sharing features to the articles and also, offline reading capabilities for the articles you choose.
Download: Wikipedia for iOS / Wikipedia for Android