PSOne Classics support comes to Vita on August 28. Along with it, Vita firmware 1.80 adds several new features to the platform – like actually using the Vita's buttons on the handheld's menu. We know!
The new firmware also adds fast rewind, fast-forward, and variable speed to the Video application. If you're using the thing to play music, you can now import playlists from PS3 or iTunes. The web browser supports rear touch for scroll and zoom, which actually seems like a worthwhile use of that rear touchpad. And there will be a new "Cross-Controller" icon in the Remote Play app to round up Cross-Controller supporting games.
That's the most noticable stuff: there's a whole list of tweaks at the PlayStation Blog.