The Sony Ericsson phone is also reported to pack in 1GHz Qualcomm CPU, 512MB of RAM, 1GB of ROM, and a screen "in the range of 3.7 to 4.1 inches."
What it doesn't have is an analog nub like the PSP and PSPgo. Instead, it appears that a touch-sensitive track pad on the slide-out controls will replicate the function of the PSP's analog controls. (UMD and Memory Sticks appear to be eliminated as well.)
That touch pad technology sounds similar to the tech featured in the genuine successor the PSP, which we're told has a touch pad on the back of the device as well as dual analog nubs for control. The PSP2, which Sony has not yet officially announced, is said to be due fall 2011.
The PlayStation Phone [Engadget]