Support for mATX.
Slim optical drive up top, to make room for more drives.

And two changes related to the power supply:
- the option of a solid panel where the power supply mounts for those who want to use a pico PSU: http://www.mini-box.com/picoPSU-160-...pter-Power-Kit
- an add-on drive cage that mounts under the existing one for people who will use a pico power supply. With a bracket that extends down to the bottom of the chassis for stability, but does not interfere with the add-on/video card mounting.