Apple just releases iOS 5 beta 2 for iPhone, iPad and iPod touch devices for Developers. Build 9A5248d is available now in the Dev Center for registered iOS developers. Apple has also pushed out new iTunes 10.5 Beta 2 for developers.
- With iTunes 10.5 beta 2, and iOS 5 beta 2, wireless sync now works.
In iOS 5.0 beta 2, wireless syncing is now available for the Mac. It requires iTunes 10.5 beta 2 and OS X 10.6.8 or Lion. You will see an option to enable wireless syncing when you connect your device to iTunes with the USB cable. It is recommended you perform your initial sync with a cable after restoring your device.
Wireless syncing is triggered automatically when the device is connected to power and on the same network as the paired computer. Or, you can manually trigger a sync from iTunes or from Settings -> General -> iTunes Sync (same network as paired computer required). Be sure your device is plugged into a power source when performing Wireless syncs.
From the release note of iOS 5 Beta 2 and iTunes 10.5 Beta 2:
iMessage seed 2 will be unable to communicate with iMessage users on seed 1.
The version of iTunes that comes with beta 2 cannot sync devices that have the beta 1 software installed.
Developers can download iOS 5 Beta 2 from here.