So what does this all mean for massively multiplayer games? Lots.
First of all, remember how Blizzard is officially planning to make a mobile version, or at least a mobile appliation, for their MMO? They've been dreaming for something like the iPhone SDK to come along, and odds are that, along with Google Android (another mobile development platform), any application Blizzard develops will run best and probably first on the iPhone. Lots of game developers are already interested in jumping into the iPhone's waters, so we'll more than likely see a lot of first party (as in, made by actual MMO developers) applications on mobile devices like the iPhone.
And then there's third party applications as well. Dungeon Runners recently opened up their character information in an open format, and that makes it very possible for other developers to create unofficial applications for players. EVEMon is a terrific program for EVE Online players to use, and the features announced by Apple today will make it super easy for developers to make programs like that specifically for the iPhone -- so you'll be able to check your skills schedule even when you're out and about.
And finally, there's a whole other realm of MMOs here that we haven't even scratched the surface of yet. Games like Parallel Kingdom depend on mobility, and that makes the iPhone (which will not only give an application its real-world location, but also stay connected to the internet via Edge) the perfect kind of platform for that development. Apple programmer Wil Shipley is already dreaming of massively multiplayer pet games (in which the pet in your iPhone might interact with other iPhones in the same location), and as programmers get the hang of programming for the platform (consumers are set to experience the first apps in June of this year), the games will only get better and more inventive. The best MMO of 2009 might not even be on a PC or a Mac -- it might be a massively multiplayer game played entirely on the iPhone mobile platform.