Unit 13 is an online-enabled shooter that lets you play a variety of short missions. There are four mission types: Direct Action, Deadline, Elite, and Covert. While there is no online competitive play, unlike Zipper's other shooters, there is online co-op, and a persistent leaderboard that can be updated via 3G.
The PlayStation.Blog has a video walkthrough of a Covert mission:
Andrew Yoon posted a new article, Unit 13 releases on Vita in March.
Zipper Interactive's Unit 13 won't quite be ready for the Vita launch--but it will be pretty darn close. Unit 13 will be available on Vita at retail and on PSN on March 6th.
This looks really nice. I just wish the dual analog sticks were at the top of the unit and not at the bottom...hand cramp will certainly ensue due to their current location. Maybe not, but natural thumb position is as they are if you turn the unit upside down. Maybe MS will release one of these one day for the hard core market.