I hope the mobile OS scene will finish soon, as there isn't one that really cares for users. Android is just scary: why antiviruses are recommended on an OS derived from Linux is beyond logic: they took Linux and "evolved" it towards Windows 95 class security. OTOH, iOS has the security that Android should have, but unfortunately the iOS security is driven not by users convenience, but by Apple convenience: approval on the AppStore is done on the basis of what Apple likes, not what users want.
Fortunately, we're quickly arriving to a moment where new released tablets can run complete OSs, such as complete Windows8, and Linux, so we can finally use mobile devices that have adequate security, aren't limited on features, and have a long time evolution. The sad point is I don't see Apple releasing an OSX tablet, but anyway I hope the mobile OSs scene (android and iOS) to finish soon and never come back, for the good of Humankind.