First video:

 http://www.youtube.com/watch?v=azNe7CC4mjA&feature=channel_page

Some impressions:

Just finished a skirmish match, and it rocked. In the demo you can have up to 3 spartans at a time and they have three different upgrades so far that I have seen. The first upgrade gives them a chaingun, the second gives them faster reflexes to improve movement speed and vehicle jacking ability, and the third gives each spartan a spartan laser.

So far I am very impressed with most of what I see. The scroll speed could be a little faster, and sometimes if an infantry unit is blocking a vehicle it will try to go around but will give up after one try.

There is a promotion system for troops from what I have seen kind of like C&C that is represented by stars. The most stars I have had for a unit is 5, but I am assuming that is the highest it goes. If a spartan gets into a vehicle, that vehicle is automatically promoted to a five star rank.

Spartans will regen their shields if not being fired upon, and any other unit can be healed by some sort of regen tool from the spirit of fire. Just hit up on the d-pad and choose the option, then select the target and instantly begin healing infantry and vehicles alike as long as they are in the circle.

You only have the ability to play as the UNSC in the demo save for the tutorial so I can't comment on the Covenant much.

I was excited, but skeptical on how Ensemble would do with this game, but they made a *** fine game if the demo represents the final build in any way.

Some blurry screens:

Wish I could play the demo already, too :(