Mass Effect: Infiltrator, which will be developed by Iron Monkey Studios. If the name sounds familiar, it's because that is the same development team that built the impressive Dead Space game for iOS and Android, so that speaks well to the potential of this game. Infiltrator will be a 3rd-person shoooter in which you rescue prisoners. The tie-in to the upcoming Mass Effect 3 will be in that every prisoner you rescue will count towards the "Galaxy at War" mode in ME3, which influences how the story plays out.
There is no word on a release date, but given that ME3 is due out on March 6th, we'd assume that Infiltrator will be out before then. There is also no word on an Android version of the game, just the iOS version. In addition to Infiltrator, there will be an iPad app called Mass Effect Database, but no info on that either.