There are major rumors going around that Sony Erricson is working on integrating a slide out game pad on future generations of Android based phones.
The cool gaming phone would sport a 1GHz Snapdragon processor, a screen size between 3.7" and 4.1.", D-pad and a "long touch pad" in place of a joystick.
Its also rumored to come with android 3.0, aka Gingerbread, which will give you a time frame of when this device might be out (considering 2.2 is just rolling out for select android phones).