[UPDATE: NOTES] Apple seeds iOS 5 beta 4 to developers: first OTA update

Apple today seeded the fourth beta of iOS 5 to registered developers. The build number is listed as 9A5274d. In addition, Apple seeded iTunes 10.5 beta 4 to developers, which is required to install the new beta build.

This build can be installed using the new over-the-air upgrade feature.

Developing...

UPDATE: Notes and changes:

The OTA update feature doesn't appear to be working yet - you see an error when checking for updates. We're going to continue to wait and try as we'd like to use this update method
Wireless syncing as been enabled for Windows users in this beta
And we're downloading!

OTA updates begin downloading automatically, but require acceptance before installing. In addition, OTA updates work over 3G
We're still on the less than one minute remaining point. Sorry about this delay
The update has installed and verified. We're restarting right now
Apple now says that switching to Wi-Fi (over 3G) will improve location tracking
Usage section in Settings: Cellular data is now in its own separate section
Voice Roaming on/off, first added in beta 3, has been removed
New "Documents and Data" section in iCloud settings:

Just from some quick browsing, we noticed that this build is much more stable and faster than beta 3. Many issues have been addressed
Opening the camera from the lockscreen works significantly faster now
Those are the most evident changes. It seems as though this update was more of a test of OTA, as well as addressing bugs. We'll continue to update this post with changes (if there are any more).
Our final note for right now: there are a few new bugs in this release, especially with how lockscreen notifications display.
The new way to expand Notification Center in full screen apps (double swipe down) has been expanded to more apps.
More notes on OTA updates: the Settings app will have a badge if there is an update available; OTA updates work on either Wi-Fi or 3G; jailbroken devices can't use OTA updates (or at least not yet)

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