Panajev2001a from the NeoGAF forums has discovered a series of patents that point to a new handheld device from Sony. The patents, filed in January, refer to a "hand-held device with touchscreen and digital tactile pixels." The patent is assigned to Sony Computer Entertainment America, and the inventor is credited to be Phil Harrison, former head of Sony Computer Entertainment Worldwide Studios.
This patent could describe the next PSP (or PSP Phone). However, it could take years for anything to surface after a patent filing. Some patents (like this one) haven't seen the light of day. With a touch screen and motion sensing capabilities, whatever this new device is will be able to match the functionality of devices like the iPhone. Intriguing. Can't wait to find out more.