Largely cosmetic but there are some functional items and a couple of ticks lower on the Geekbench scale.
The iBooks icon get a redesign. There is a contextual change in Photos. Some of the icons in the Settings app get changed, specifically in the App Permissions section. Notification Center widgets icons get a few more pixels.
In the keyboard section of the Settings Application, there is now a toggle to ‘Enable Dictation’, so you can turn it off if that is your choosing.
If I find anything else, I’ll let y’all know.