Will we get the first digital medium format mirrorless camera soon?

Sony could once again lead the digital mirrorless camera industry in a new territory. SonyAlphaRumors reports that there is a 50% chance Sony will announce a sort of digital Mamiya 7 but likely with fixed lens within the next 5-6 months!

The sensor should be the one already in use by the new Hasselblad and Phase One cameras (50 MP Cmos). There is not other detail yet but it sounds quite amazing!