Enabling PlayStation Plus, the browser as an app you can open during game sessions, email app, backup over Wi-Fi, cloud storage for PS+ users, improved browser performance and other goodies. Features video here.
A few quick tests and notes:
If you launch a PSM title, you will get a new version of the PSM runtime package to download.
Email tested, added a Google account, looks pretty easy to navigate and use. You can check for new mail periodically, add multiple accounts and can be loaded on Startup (from the main Settings app).
Maps, now with added weather and traffic, enabled in the Maps settings section.
Content Manager over WiFi doesn't seem to work, its asking for a setting in Assistant that I can't find (good old Sony and its PC apps). NOTE - You need to download a new new version from here.
PS+ Cloud Storage, need to sign up for that...
More options for Notifications, why are Sony obsessed with flashing lights as a UI method?
Near has had a major upgrade, is faster and less obtuse.
The web browser is a lot better supporting HTML5 according to html5test.com
Trophy synching is a lot faster
The official features list:
Support for PlayStation Plus has been added.
Email app has been added to the home screen.
You can now transfer content between the PS Vita system and a PC using Wi-Fi.
You can now transfer a folder from a PS3 system or a PC to the PS Vita system.
Maps can now display weather information.
The display performance in [Browser] has been significantly improved.
The buttons on the PS Vita system can now be used with more applications.
In Settings, you can now set how you will be alerted depending on the notification type.
In addition, the usability of many features has been improved.