Not only will Baldur's Gate Enhanced Edition, the remake of the classic Bioware RPG, have online co-op play, but the online co-op can be enjoyed crossplatform. In other words, players can do some co-op between PC, iPad, Android, or Mac.
According to developer Trent Oster in a "#bgee will have co-op multiplayer and will work across platforms. iPad can play with Android, Mac and PC. On happy gaming family.",
Baldur's Gate Enhanced Edition is due to be released on the 18th September.