iOS 5 Beta 2: User Interface Tweaks, 3G Over-the-Air Updates, Native Scrolling in Safari
AppleInsider posts a couple of screenshots from the new lock-screen notifications which show a slightly more prominent display:
They also point out that the keyboard in iMessage now recedes when scrolling upwards into message history.
3G download support for Over the Air updates appears to be confirmed with these strings found by 9to5mac. Apple had announced that the new version of iOS will support "Over the Air" updates which allows the operating system to be upgraded without syncing to your computer. These strings seem to indicate that this can occur over Wi-Fi or 3G.
Another more subtle tweak was posted by Johan Brook which reveals that Apple is now supporting a new CSS property that will allow web developers to get "native" iOS scrolling behavior in their web apps. This refers to the "momentum" inherent in native apps. DaringFireball previously described this behavior: