Dude i was just about to ask the same question , you read my mind xDD
well mine came with 3.52 on it , and as far as i know nope it can't be hacked .... yet
when 3.51 was released , it didn't take them too long to discover an exploit in one of the games so this probably won't take long too ... i hope
and since Sony revoked PSM now , it became harder for the devs to hack it , even Yifan lu (if you know him) quit the PS Vita scene , so i am a bit disappointed T-T
but don't worry ... something is bound to happen eventually
and about that , the Vita's games aren't really "hackable" yet like the PSP , it will probably take too long before we see some pirated games , but it will happen no matter what , every console we know of ( except for the ps4 and the vita that is ) has been pirated after all
so for now you have to buy games to be able to play them .
Btw , add me on PSN : BlackDark2013
Happy playing !!