A game talked up to be a potential ‘system seller’ is one thrown around all too often for our liking. Sure, Resistance might well be an enjoyable, if slightly mediocre, Sony-exclusive first-person-shooter. But a system seller? LittleBigPlanet, though adored by us and many Sony fans alike, is unlikely to be considered in the same vein as God Of War, Gran Turismo or Uncharted when trying to summate what it is has allowed the PS3 to claw back Xbox 360’s early sales success. A ‘system seller’ by rights doesn’t come around too often, but when it does it can make all the difference in the world. Now confirmed for the autumn, Call of Duty’s debut on the Vita might well be (and we believe it definitely will be) Sony's crowning glory for its follow-up to the PlayStation Portable (PSP).