[quote name='FlyingMonkey9']Wonder if peace walker- when it's released digitally on psn, will also be playable on vita?[/QUOTE]
It's on PSN via PS3, sp you have to download it to a PS3 then transfer it over to the Vita.
Note: "transfarring" does not work between the Vita-based PSP version and the PS3 version--you need to play it on an actual PSP to take advantage of the feature.
I own almost every Vita game, but I refuse to pay more than $20 for this b/c: 1. most of MGS2 sucks (thanks to Raiden); and 2. f*ck Konami for not including Peace Walker.