Yes its free multiplayer. The SP may or may not be free, but that is far off at this point anyway. Personally I'm sick of multiplayer games. I really prefer a good old single player with some work and thought in it. The last thing I care to hear/read is people screaming about their penis, or other random idiocys over the chatbox. If I wanted to hang out with violent people who can't communicate I'd just go drinking on the weekends.
anyway if you want to see what the ATR is kinda going to be like check here
http://www.the-junkyard.net/files-ss2845.php?action=listfiles&category=3
and download the first video. Its 51 megs, but well worth it. This was shot a while back, and soon the project will be upgrading its engine, to support shaders and other "next gen" type things, so it will only look better.
Also Leo, you fanboi you, you can see more of the work for the project on that site (the junkyard) and the project site for starsiege 2845
Sorry for the temp hijack.. now someone get us back to wallpapers.