I saw a video ad for Bloostar today on Facebook. So, apparently, they have a marketing budget.
Their web site is pretty slick.
I noticed on this thread that there was speculation they would use RP1 and hydrogen peroxide. But an article on Parabolic Arc from 2015 (after the last post in this thread before today) says they'll use methane and LOX:http://www.parabolicarc.com/2015/10/16/update-bloostart-launch-system/
Another interesting tidbit from the Parabolic Arc story is that the price for a launch is projected to be $4 million. The orbits are 125 kg to 400 km at 27 degrees or 75 kg to 600 km SSO.
Rocket Lab is projecting 150 kg to 500 km SSO for $4.9 million, with an earlier launch date. Since Rocket Lab's customers seem to be shared launches of lots of cubesats, I think Bloostar is in trouble if both Rocket Lab and Bloostar meet their targets.