The difference between the myTouch2 / myTouch Slide and the original T-Mobile myTouch 3G is that the former comes with a sliding QWERTY keyboard. There's also an optical trackpad instead of a trackball.

Here's the specs of the myTouch Slide:

* 320 x 480 pixels touchscreen display
* 3.5mm headset jack
* ARM11 processor
* Photo camera with LED flash
* MicroSD card slot (accessible without removing the battery / back cover)
* 1,300 mAh battery

This phone will be available May 17th, no price announced yet.