At the moment I try to get a first overview about all filetypes, structures and as the basic research on the firmware file (.pup) is done, I continue with PS VITA package (.pkg) files.
Due the next days I plan to open a wiki for devs about the PS VITA, then I will summarize and publish more specific information about all I my research.
For now here's an overview about the PS VITA game package file content structure:
