by Firestone Overnight, the very popular science-fiction conquest game went live on the iPad—it's called Eclipse: New Dawn for the Galaxy. Eclipse is a 4X game—eXplore, eXpand, eXploit, and eXterminate. It's made by Big Daddy's Creations, who did a slick job with their iOS version of Neuroshima Hex. By all accounts, this game is just as slick. The price is $6.99—which is much, much cheaper than the physical version. At some point it will almost certainly go on sale (I picked up their Neuroshima Hex game on a sale a year ago). It does have an AI, and it does have pass-and-play and asynchronous multiplayer—and it supports up to six players.
I've played the physical version, and it's a lot of game. If you like space-conquest games at all, consider checking out Eclipse.