I know this is an app but it was news worthy seeing as a lot of people were waiting on the app.
"Update (5/24): It’s time to close up those gates and keep those inmates in line. As promised, Prison Architect: Mobile has been released for Android in the Google Play Store from developers Introversion Software and Tag Gamese. Keep in mind that while this version of the game is free to play, there are in-app items to buy ranging in price from $0.99 to $13.99."
Did you try it out yet?