Looks like it's the EOS Cinema DSLR Concept that was mentioned when the C300 was announced.
http://www.engadget.com/2011/11/03/canon-has-a-new-eos-movies-dslr-on-the-way-too/
http://www.engadget.com/2011/11/03/canon-has-a-new-eos-movies-dslr-on-the-way-too/
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