From the latest pic[0], it looks like the AeroVelo Atlas[1]. Some details on their design can be found on their site[2], although the info looks to be from 2012.

[0] https://twitter.com/AeroVelo/status/345219802262036481/photo...

[1] http://www.youtube.com/watch?v=jcFyor9Gl0Q

[2] http://www.aerovelo.com/projects/helicopter/tech-info/