iPhone OS 3.0: Something Wicked Cool This Way Comes

Developers building applications for the iPhone best make sure their work runs on the device’s forthcoming 3.0 OS. Because effective yesterday, Apple is no longer accepting applications that don’t. “Beginning today, all submissions to the App Store will be reviewed on the latest beta of iPhone OS 3.0,” Apple said in a message to developers Thursday. “If your app submission is not compatible with iPhone OS 3.0, it will not be approved.”

Clearly, OS 3.0 had to be truly stable for Apple (AAPL) to issue such a mandate. And that suggests that the company is ramping up toward an official release–most likely at its Worldwide Developers Conference in early June.