So far, Sony has not made any official announcements regarding the next version of its portable system -- if another version is even planned in the first place. However, considering how susceptible the internet is to rumors, gamers have pointed to a survey on PSP Fanboy which Sony apparently released in order to poll users on what they want to see in Sony products. Besides things like better Home integration and various Bluetooth support items, the survey mentions a touch screen for the PSP. That's really all there is to this rumor thus far, but this survey could indicate that Sony is at least aware of consumer desire for touch screen implementation, which could lead to interesting developments down the line.
A Sony representative was not available to confirm the validity of the survey or to comment on its implications.