MacRumors.com

In an e-mail sent out to registered iPhone developers a short time ago, Apple announced that starting today, all applications submitted for App Store approval will be reviewed using iPhone OS 3.0 to ensure compatibility with the forthcoming operating system. Apple also announced that while all existing applications should be compatible with iPhone OS 3.0, any applications that are found to not be compatible after its public release are subject to removal from the App Store.

All apps must be compatible with iPhone OS 3.0
Millions of iPhone and iPod touch customers will move to iPhone OS 3.0 this summer. Beginning today, all submissions to the App Store will be reviewed on the latest beta of iPhone OS 3.0. If your app submission is not compatible with iPhone OS 3.0, it will not be approved.

Existing apps in the App Store should already run on iPhone OS 3.0 without modification, but you should test your existing apps with iPhone OS 3.0 to ensure there are no compatibility issues. After iPhone OS 3.0 becomes available to customers, any app that is incompatible with iPhone OS 3.0 may be removed from the App Store.

Apple also announced in the e-mail the availability of iPhone OS 3.0 and SDK Beta 5, which were released to developers yesterday.