WebKit

• NEW: In iOS 5 beta 2, a new inherited CSS property, -webkit-overflow-scrolling: value, is available. The value touch allows the web developer to opt in to native-style scrolling in an overflow:scrollelement. The default value for this property is auto.
• The WebKit framework has picked up a newer WebKit engine, which closely matches Safari 5.1. Some areas to be aware of with the new WebKit framework on iOS:
  • There is a new HTML5-compliant parser.
  • Text layout width may change slightly because word-rounding behavior now has floating-point-based precision.
  • There is improved validation of the form field, which includes removing leading zeros and number formatting.
  • Touch events are now supported on input fields.
  • window.onerror is now supported.
  • There is a new user agent that does not have locale information in the User Agent string.

WiFi Syncing

• In iOS 5 beta 2, wireless syncing is 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.
  • If you find issues with apps, media and/or photos synced to your device, you can reset then resync. From Settings -> General -> Reset, choose Erase all Content and Settings. Then reconnect to iTunes and sync again.
• FIXED: In this beta, iTunes may incorrectly report Photos as “Other” in the capacity bar. Photo syncing otherwise works as expected.
• NEW:In some cases, your device may fail to sync contacts, calendars and account settings, or back up to iTunes. If this happens, reboot your device and re-sync.
• NEW:In some cases, syncing photos may result in only thumbnails on your device. If this happens, unsync Photos then re-sync again.

Xcode

• In this beta, device restores using XCode are disabled. Please use iTunes only to back up and restore your device.
• In some cases, Xcode 4.2 Organizer does not display a device that is in restore mode. As a workaround you can use iTunes to restore.
• FIXED: On some desktop machines, Xcode's memory usage inflates incredibly fast while restoring a device or copying an IPSW. As a workaround use iTunes to restore.
• FIXED: In this beta, crash logs (either unsymbolicated or symbolicated) do not appear in Xcode Organizer. To make them appear in the Xcode Organizer, you will have to rename the device.
• In iOS 5 beta 2, the iOS Simulator is not compatible with previous releases of the iCloud Developer Seed for OS X. It is highly recommended that you update to the latest iCloud Developer Seed to ensure compatibility.

iOS 5.0 SDK supports both iOS 4.3 and iOS 5.0 simulators.