This looks very interesting. The sample videos look pretty good too. Though ISO performance starts get noisy around 800, but for $3K you're not going to get the C300 sensitivity. There's a pretty detailed write up by John Brawley who got early access to the camera:
http://johnbrawley.wordpress.com/2012/04/17/blackmagic-cinema-camera-lets-t...
I haven't seen a ship date for this yet. Anyone know? 2012? 2013?
Ryan Holmes
http://www.ryanholmes.com
vimeo.com/ryanholmes