Hopefully, once the game gets near release, BF will publish some succinct (wargame vids tend to run on far too long for some reason ) and polished promo vids to Gametrailers, YouTube, etc. However, like most wargames, I suspect CMBN will receive the best press from word of mouth post-release.
Does BF have a Facebook page? If not, that is a real easy way to get the word out there.