Part of me wouldn't be surprised if this is the high MP body.
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It'll certainly be something "completely different" from other digital MF: it won't exist. Even though Sony appears to be trying the 'scatter gun' approach to camera systems I cannot believe they will want to develop a system that's in a segment of ever decreasing market share and something of a niche area now. They havent been able to make much inroads into the Nikon/Canon upper end of the DSLR market let alone MF.
I think this rumour's about as credible as the Canon MF one - CR 0.
Canon will be making a major annoucement at this show.