Can each body connect only to the back of the same label?
No, from what we've been told so far, the cameras will be identical so you can swap bodies of different brands if necessary.
Is the lens mount different on those bodies?
Same lens mount on all the cameras. They should be 100% identical mechanically.
Why is the hy6 system considered superior to Hassy and Mamiya?
Better lenses? Sync speed? Focusing?
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I'll stay away from calling it superior right now but yes it has higher flash sync than the Hasselblad (1/1000 v 1/800) and both are much faster than the Mamiya.
Some prefer the results of these lenses, but you can make up your own mind about that when you see samples (which are already out there because the lenses have been out for years). I believe there's a wider selection of lenses already out there than the Hass H system. I know nothing about Mamiya.
The AF on the Hy6 was reported by some testers to be the best of medium format, but we are really waiting on the first wave of real user reports to know these things for sure.
Handling has been well received, but again that will come down to individual preference.
One difference is that the Hy6 can be used with a waist level finder in portrait or landscape modes. The others can't. Also you will be able to change orientation by just rotating the back, not the whole camera.
Finally, some are hoping for larger sensors in the future, such as a square 56x56mm sensor, which only the Hy6 and view cameras will be able to use (of all the current platforms).