It actually fixes quite a few issues, Uscon. Fonts are better, speed is much better in many ways. Snappier, to coin a much over used word. Appearance of the keyboard is far better, for example. As usual, in an iOS update, there are new features. It's worth doing. . . and it closes some security holes.
I’ll wait for the jailbreak and Apple to fix the bugs in the new iOS before I upgrade.