
As expected, Apple has released the fourth beta of iOS 7 this morning. The update comes three weeks after the release of beta 3—longer than the the time period between previous betas due to a lengthy Developer Center outage caused by a security breach.
Beta 4 is available now to all registered Apple developers via OTA (over the air update), which can be installed by visiting the Software Update section in the Settings app of devices that currently have iOS 7 installed. And it should post soon to the dev portal…
The previous beta brought about a number of UI tweaks and changes in apps like Music, Mail, Weather and the Notification Center. There were also several performance improvements made, making the firmware faster and more reliable than previous releases.
The fourth beta is available for compatible iPhones, iPads and iPod touch models. We’re currently installing it ourselves, and will be reporting back with any new stuff we find. So make sure you keep checking back with this post throughout the day for changes.
We will keep updating this post with a running change log of findings (below):
Lock screen is no longer confusing:

– Call button in Phone dialer is tweaked:

– Phone answer buttons tweaked:

Spotlight:

HDR in camera re-located:

– You can now swipe between panels in Notification Center
– Tweaks to image download in Mail.app:

– Safari graphics tweaks:

Tweaked filters UI (and added for some older iPhone models):

Search bar in Reminders:

– Readers reporting minor keyboard tweaks

– Improved back buttons in setup:

– New AirPlay icons:

– Slight UI tweak to Newsstand:

– Shuffle all songs is back:

– Improved animations and transparency in folders on the Home screen.
– New iPad resolution changing button while running iPhone-only apps:

– Completed uploads notifications:

– Siri Q/A
