No air units appear in the game, and judging from the FAQ on Steel Beasts we may never see helicopters included. Steel Beasts is not hardware accelerated, and runs at a fixed resolution of 640x480. The game looks pretty darn spiffy for just 640x480 and being without the benefit of a 3D card. The horizon seems to go on forever, and forests are made up of hundreds of individual trees, which really helps the immersion factor. The terrain is also sufficiently varied in elevation to really make you feel like you're in the real world, and allows you to use real world tactics.
Units look good, as do most of the combat effects.
Raining ICM munitions down on an enemy is a sight to behold. Now, of course everything would look even better with hardware acceleration, or at least being able to bump it up a resolution or two, but don't let graphic mode fool you. After just a few games all you'll be thinking about is how great this puppy plays. Missing is a campaign. Even a linked campaign would have been nice, but at least the single player scenarios are a nicely varied collection of one shot missions.