Looks like BioWare feels bad about pushing Mass Effect for the PC back a couple weeks. Chris Priestly, the BioWare Community Manager has posted a screenshot of the HUD features in the game at the official forums. Apparently, all you need to do is hit the space bar in gameplay to bring up this menu system where you can command your team mates as well as use your own abilities. It looks pretty functional.
Awesome Full HUD Image After the Break!