From what I see in the picture, it is simply a PL mount for the new Canon cine zoom lenses. One would remove the existing EF mount and replace with this new PL mount, allowing one to use these new Canon lenses on professional cameras with a positive lock lens mounting system.
So it changes the EF mount of the new light weight zooms to PL. I'm missing how that helps the c100 EF mount, If theirs a solution to get PL lenses on C100s I would very much so appreciate a link