In OS 4.0 beta 4 Mobile Safari suffers minor UI changes. Probably not even visible. At least i didn’t notice it until i got 4.0b4 and 3.1.3 side by side. When you tap on Google, the cancel button is on the right side of the search bar and not above it as before.
Apple added a new “accessibility” feature into Settings.app for visually impaired or elderly people. You can now change the size of the text in various stock apps like Notes, Messages and Mail