You can sign up for the alpha here: http://www.airme.ch/
and the official forums are here: http://carbongames.com/
It still has a lot of rough edges, in my opinion, and some aspects of the game I don't find particularly satisfying (yet) But the cool thing about it is that it has potential as an esport, and people are already starting to cast games.
(a lot of visual effects are turned off in the video, so it looks much better on a decent computer)
Shacknews article from January:
AirMech provides a compelling blend of action and real-time strategy. As in DotA-style games, the objective is to eliminate the enemy's home base, while defending one's own. Players take direct control of a commander-type unit called an AirMech, the initial version of which can transform between a ground-based mech and a fast-flying jet at the touch of a button
[...]
I asked developer James Green about AirMech's inception, and the spiritual DNA it seems to share with both DotA-style games and the 1990 Technosoft-developed Herzog Zwei. "The initial inspiration was Herzog Zwei, and it was about 10 years ago I got the itch to make a modern update of it," Green told me.
[...]
I asked developer James Green about AirMech's inception, and the spiritual DNA it seems to share with both DotA-style games and the 1990 Technosoft-developed Herzog Zwei. "The initial inspiration was Herzog Zwei, and it was about 10 years ago I got the itch to make a modern update of it," Green told me.
http://www.shacknews.com/article/72090/indie-jeffs-weekly-pick-airmech-alpha
You can also look at Total Biscuit totally fail to understand the game here (old footage) :