PS Plus on Vita
Sony confirms it for November.
Sony has today confirmed that PS Plus is coming to PS Vita in November.
The news was revealed on the PS Blog, where it was confirmed that: "both existing Plus members and newcomers to the service will not have to pay any extra for the expanded offering."

The blog also provides a basic rundown of the features we can expect from the service:
Games: Plus members get to play the full versions of designated content for PS Vita available on PlayStation Store as long as their membership is effective, at no extra cost.
Discounts: Access exclusive discounts on certain PS Vita titles.
Online Game Save: Upload game save data for compatible games to Online Cloud Storage, offering up to 1GB of space.
Automatic content downloads and updates: PS Vita will automatically download designated game demos and game updates, and also download system software updates.
Automatic Trophy sync: PS Vita will automatically start up at a designated time to sync Trophy information across PlayStation Network servers.
This morning Sony also announced two new PS3 models are set to be released on September 28.