The Apple Dev Center has recently been updated, and iOS 5 Beta 1, as well as the 4th developer preview of Lion, are now available for download by registered developers, and can be obtained from Apple’s development hub.
The build number for the new Lion preview is now 11a480b, and it should contain all of the new features demoed at today’s WWDC keynote, including full integration with iCloud.
It will be interesting to see what kind of experience developers will have with the iOS 5 beta, and how well (or seamlessly) it really integrates into iCloud…
If you’re a developer, hop on over to developer.apple.com to get your goodies!