An update from Guerrilla Cambridge gives PS Vita users a calendar of patches and DLC on the way.
The first patcg, due in the "next few weeks" will be the one that reduces the size of the other patches by about 800MB. That'll free up some room.
There is a patch coming in January that will help reduce online problems, as well as fixing team balance issues.
Following that is the big one: Update 5. Two new multiplayer maps for FREE, and the release of offline Botzone for Mercenary and Guerrilla Warfare modes. (This is the quote from the page, I wonder what "following that one" really means in real time.).