1) Lock screen 'slide to unlock' redesign, now with an arrow heading right
2) Lock screen swipe up/down for control/notification center icon redesign, now a flat line instead of arrows
3) Notification center now allows swiping left/right to change between different pages
4) Spotlight search now features a 'cancel' button
5) Phone app keypad redesign, now doesn't cover whole screen
6) Reminders app now features search function
7) Camera app relocates the HDR button now at the top, middle instead of bottom. Live filters now available for iPhone 4S
8) Redesigned bookmarks/shared links/reading list icons in Safari app
9) iPhone 4S and above running iOS 7 can now pair with Apple TV as a remote by just tapping the phone on the TV
10) Overall smoothness in the UI
Check out these videos for other minor updates in iOS beta 4 :
1) http://youtu.be/vsNQOVBX2g8
2) http://youtu.be/rDgeWFv9dbo
;)
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