Today just seconds ago Sony had pushed out update 4.00. The changes only include adding support to the upcoming PSVita. This will most likely patch KaKoRoTo's exploit.
Eric Lempel, VP of SNE:
It will allow users to copy their digital content such as games, music, photos, and videos between PS Vita and PS3, back up PS Vita game games including save data to your PS3 hard drive, and update the system software for your PS Vita system using the network features of your PS3.
What’s new in v4.00:
PlayStation Vita system compatibility
You can copy content such as music, videos and images, games, and other applications between the PS3™ system and the PS Vita system.
You can back up the data saved in the PS Vita system to the PS3™ system disk drive.
You can update the system software for your PS Vita system using the network features of the PS3™ system.
Other changes in v4.00:
- PlayStation Plus members can now choose to enable or disable each automatic update feature
- Game patches
- System software
- Recommended games and videos
- Sync trophy information
- New PlayStation Network settings for filtering friend requests and messages