Today we have yet more leaks from Sony's gaming division to help inform your purchasing decisions - this time regarding the long awaited and much-needed proper sequel to the little portable PlayStation. Sony's tweaked its PSP numerous times before, adding the Slim & Lite model to the range last year, then tinkering with the screen a bit in this year's 3000 model update. Now, Eurogamer is telling the world that a further revised PSP - the model 4000 - will hit in late 2009, followed by a proper, all-new PSP2 at some random...