You can download the file from mutinystudios. I found it @ davidelasala.com, which links to that zip file.
The mutinystudios site however does not have a page or link to that character. I didn't see any disclaimers on their site nor on David's, but if this rig is not for public use, please let me know.
The rig reminds me of the ball with leg character from Animation Mentor. This one comes with Footroll, Toepivot and Toetap controlls on the feet, as well as Stretch, Bend, Bendrotate for the body and Legstretchers.
Included as well are shaders for a nice render out of the box. Here you can see a test animation.