It would be interesting to know, of those here who are saying they would buy the new Sony....
 Would it be a supplementary camera, or your main camera?
 If it would be your main camera, what system would you be moving from? FF DSLR? APS_C DSLR? Smaller mirrorless?
1) a mirrorless FF-sensor system camera like the Sony A7/R will be my only camera (other than smartphone)
2) Currently Canon 7D + all good EF-S lenses and a few good EF-lenses and a few speedlites. Will definitely have been my last DSLR system and my last APS-C camera.
Like the new Sony A7/R (as per rumored specs), but don't like Sony at all.
For my photography as amateur/enthusiast I need only one camera system at a time and I don't want to buy, own, store, insure, carry, learn and use more than one camera system in parallel.
Looking for a small light photographically fully capable FF-sensored mirrorless camera and a small set of "AF-only" lenses. [no manual focus ring, no manual focus gear, no distance window, but weathersealed @ IP67].
Ideally a 24-70/85 f/4.0 IS for street/city/events/general purpose/walkaround, a 20mm/4.0 pancake mainly for landscape/city/architecture, a minimalist pancake 40mm/2.0 for street/people @normal angle, a 85/2.0 pancake for studio/portraits/concerts and a very compact and light tele lens for travel, say a 200mm/4.0 plus 1.4x teleconverter. Plus wireless ETTL flash trigger built into camera and 2 slave speedlites. Entire system for less than the price of a Leica M240 with 50/2.0. That's it. :-)
Since I am most familiar with Canon's UI and prefer it over any other I've touched so far, I am still hoping for Canon to put 5D Mk. IV innards sans mirrorbox and prism into a Sony A7/R-sized body. Plus above mentioned lenses. If such a package comes at reasonable price before my 7D dies or I get too sick and tired of waiting, I'm in. Otherwise I'll buy elsewhere whatever comes closest to my shopping list.
If I had to buy tomorrow, it would be the A7R (preferred) or A7 ... depending on AF performance ... plus 24-70/4 plus EF-adapter. :-)