In Little Deviants the players is shown using the pressure sensative rear trackpad to cause the land in the main screen to rise up.

DS touchscreen and 3DS touchscreen can not do that what so ever.

Just because DS a touchscreen does not mean that all future touchscreens are irrelevant. Even more so when NGP touchscreen is more advanced than DS/3DS touchscreen and the addition of the rear touchpad only brings touch controls to a new level.

For one, it allows touch controls without the hassle of blocking the screen with a stylus or fingers.

You may think that means nothing, but it means a lot.

Rear touchpad, since it is multitouch can also be used to emulate L2 and R2 buttons, giving it once again, more options.

This will make shooters play pretty much identical to that of home console.

Indeed, The PSP2 is quite a full featured device. I want.

It is capable of playing ps3 style games, 3DS style games (sans 1 screen), and smart phone style games. And it brings its own innovation of the rear multitouch pad and is the first handheld to ever have dual analog sticks.

With the enthusiasm developers have for this device (both in gameplay potential and ease of making games for it), I am sure we will see a rather large and diverse library on both PSN and retail. Woooo! :D