There is only one issue, sony is getting very good at making their system incapable of running cfw. The newest psp is impossable to "jailbreak" I believe (it has something to do with hardware)
True. It does look promising. I bet it would be able to run TPT no issues what so ever. If the touchscreen is good enough, a stylus could even be used. The shape of the screen matches the shape of the current window as well.
Also realized, the touch pads on the back of the ngp would transition great, allow the user to controll brush size with them. You basically replace the track-pad with the ngp touch pad.