An adaptation of Whedon's Astonishing X-Men comics stories.
Kitty Pride's voice sure seems familiar. A certain Firefly mechanic, perhaps?
Video preview can be found here:
http://io9.com/5367852/want-to-see-joss-whedons-next-web-project (http://io9.com/5367852/want-to-see-joss-whedons-next-web-project)