There is a lot of homebrew games that release each month (vitadb).
Recently, there was 0syscall6, a plugin to just remove FOOD verification like reFOOD but works also for Skype,PSM... There's also PSVShell, a new plugin for overclocking with more options, a great gui, fixes...
There's also the bounties being worked on behind the scene (adrenaline at native res, HW acceleration support for Retroarch...) along with the port of linux being worked on aswell...
The vita scene is one of the if not the most active scene out there.