Then we changed the goal from only developing an iPad app to develop a GeoGebra Tablet app. After a year, the Windows 8 and Android apps are in the stores. The iPad app is going to be available soon, too.
Big thanks to the GeoGebra development team for bringing the app to 3 (2.5, but the iOS will be there soon, too) new platforms!
I have been using the Android beta app from the very beginning, it came a long way to be there for you in the Play Store.