50 current games and over 150 players online... good news!
I have also heard from a number of new players that some established players are answering questions/encouraging them to better grasp fundamental aspects of them game... yes, some are treated less than kindly but speaking from experience, reaching out to new players now may encourage them to stick around!!
Don't use that link for the stats. It's no longer correct. I think it only tracks Impulse players.
http://store.steampowered.com/stats/
Steam Stats is showing a constant population of around 500 with peaks at 600-700.
I mean, sure, that's not just multiplayer, but I'm sure lots of players are learning the game in singleplayer first.
In short:
IT'S ALIVE! IT'S ALIIIIIIVE!!!