It seems a fairly common consensus amonst the gossiping fishwives that a PSP 2 is definitely in the works as we speak, and that we may not have to suffer another lame iteration of the original Sony handheld before we get it.
The latest rumor comes from Eurogamer, who has been able to cite three different sources claiming that Sony is showing the system off to developers. The platform holder is revealing a number of first-party titles, and some third parties are currently working on content.
The PSP 2 is said to physically resemble a PSP-3000, and it boasts a touch-sensitive surface on the back of the machine, instead of on the screen. Apparently, this is to protect the famously damage-friendly screen of the PlayStation Portable. It's claimed that the system will support physical media, which is hardly surprising considering the PSPgo's attempt at digital distribution was terrible.
Right now, it seems almost certain that we'll be hearing news of a PSP 2 soon. Nintendo has been stealing the spotlight with the 3DS and Sony needs to pull out something more special than a PSP-4000 in order to get some attention. If the Tokyo Game Show doesn't have a PSP 2 reveal, I'll be very surprised.
New PSP has touch-sensitive controls [Eurogamer]