Exactly, PS Vita, here where I live, we talk only PSP (Play Station Portable), but yes, it would be PS Vita my question :)
Can PSP be jail-broken and install third party apps?
Technically Unity supports Vita but i imagine the road map as followed: PC -> Android (maybe Ios) -> Consoles (Vita, Xbox, Play Station etc ...)
Well, I don't know anything about the systems, but PSP is already obsolete and PS Vita is still in his Prime and has more potential
what you have in mind is very good at issue the portability
I googled and found this
PSP-Series - (1000 = 32 MB Ram), (2000 = 64 MB Ram) and (3000 = 64 MB Ram). with just this amount of Ram, won't tolerate the Unity engine