There was a bit of confusion over what sort of backwards compatibility the Sony NGP would have when it was announced earlier this year, but it looks like that particular mystery's now been cleared up. Eurogamer reports that the NGP (or whatever it's eventually called) will be indeed compatible with existing PSP games -- of the downloadable variety only, of course. What's more, the site says that it has actually seen Resistance: Retribution demonstrated on the handheld, and that all PSP games are run via a software emulator that will let you turn upscaling on or off to suit your preference -- games will also be able to take advantage of the NGP's dual analog sticks (to control your character's view in Resistance, for instance). As Eurogamer notes, that sounds similar to Sony's remastering effort for PSP titles on the PS3, which also promises to add cross-device playability. Might the NGP also get in on that act? We should know more at E3 next week.