Oh? Are you asking about backs for the Hy6? ... no real progress to my knowledge. We're all hoping... but so far, just waiting.
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There has been some real progress at Phase One, even since this thread started. Phase One has launched a close collaboration with Mamiya, producing new backs for Mamiya 645AFD family bodies, and rebranding the new Mamiya 645 body and at least one lens as Phase One products. I would surmise from facts like this that Phase One aims to build a near monopoly as supplier of fully integrated backs for the Mamiya-based 645 format product line, and is not interested in being one of three back suppliers for the Rollei-based 6x6 format Hy6 system.
Others may predict otherwise based on internet forum speculations or invoking the dogma of an inevitable eventual move to larger formats like the higher (but no wider) 6x6 format, but I have not seen any verifiable facts to support such predictions, any many pointing in a different direction, including many comments from Sinar's Thierry.