According to Wikipedia, Uncharted 2: Among Thieves is heading to the PlayStation 3 and PSP Go consoles... the latter just coming to light over the weekend.
A mysterious screenshot was discovered by ScrewAttack from the forthcoming issue of Official PlayStation Magazine, which suggests the reference to Sony's PSP Go Wikipedia entry may indeed be accurate.
For the time being it's being labeled as a rumor though, as this could simply be the Uncharted trailer playing on a PSP Go.
However, the wording above the screenshot "New screen from Unchar... for the..." begs to differ. Of course only official verification from Sony/Naughty Dog will confirm this rumor as true, so as always time will tell.
More PlayStation 3 News...