you said, you wanted mgs4 and ff13. those games are guarnteed to be on ps3. xbox360 versions are just pure speculation. imagine if you get a 360 and those games dont come out on 360.
summer
folk souls (ps3 jp import)
miina no golf 5 (ps3 jp import)
persona 3 (ps2)
jeanne d'arc (psp)
fall
heavenly sword (ps3)
ratchet and clank ToD (ps3)
final fantasy VII crisis core (psp import i guess)