So in a nutshell:
PS Vita PN+
-Included in the price of the PS3 PS+ at no additional cost.
-PS+ Vita content will be posted on the PS3 Store too (so it's also available for PS3 users who still don't have a Vita).
-1GB of cloud save storage, that will be added to the PS3 1GB storage.
-PS+ cloud saves will let you transfer game saves from retail carts to the PSN version.
-Like in PS3, 'purchase' free games while available in the store and download or play them until you keep renewing the subscription. However, if you decide to re-activate your membership, you will once again be able to play all games downloaded from the Instant Game Collection.
-Special discounts (-20% for the first offers) to purchase games that won't expire with your subscription.
-First month free games : Uncharted GA, Gravity Rush, Mutant Blobs Attack!!! worldwide, in addition to Wipeout 2048, Jet Set Radio HD and Final Fantasy Tactics War of the Lions.
-Automatic software updates.
-Automatic trophy sync.
-PS+ Vita content will be limited through DRM to 2 consoles and 2 handhelds per account.
Vita firmware v2.00
-PS+ Support.
-Email app (Gmail, Yahoo!, other IMAP/POP3).
-1080p video playback.
-Video now supports closed captioning.
-Content manager with PS3/PC now using wi-fi too.
-New web browser with upgraded HTML5/Javascript support and optimized both CPU processing and graphic rendering.
So awesome! XBL and WiiU online service, improve it!