Continuing a pattern of biweekly releases, Apple tonight seeded the fourth beta version of iPhone OS 3.0 to developers. Apple also issued a developer pre-release version of iTunes 8.2, which is required to activate the new beta. No new features in the fourth beta version have been revealed as of yet.
iPhone OS 3.0 Beta 4 and iTunes 8.2 Pre-Release to Developers Blu-Ray Evidence
iPhone OS 3.0 Beta 4 and iTunes 8.2 Pre-Release to Developers Blu-Ray Evidence