We just found this wonderful interview on Vincent Laforet's blog where Vincent and Illya Friedman (Hot Rod Cameras) discuss just about everything you wanted to know about using ‘cinema' lenses (those with PL mounts) on the Canon HDSLRs (like the Canon EOS 7D (reviews)). Very interesting for anyone wanting to know more about PL mounts and cinema lenses.
Here's a great discussion with Illya Friedman, owner of Hot Rod Cameras, a company that is doing some very interesting things to Canon HDDSLR's – notably: modifying them to support PL lenses. [Source: original post where I found this was DVculture – but it looks like they may have found it on Vincent's blog]
(Photo credit: snap from the video)