The H6D-50c has a few advantages over the H5D-50c, namely the screen, the faster shutter speeds with the new lenses, and a bunch of minor details that may or may not apply to you. CFast + SD (love it), USB3 (eh), and so on. This allows Hasselblad to get folks off the fence, and if they don't upgrade to the 100c, there's a line of folks behind them. The 50c chip has been tuned and the yield has to have gone up enough that Sony just keeps putting them out at a good profit.
Personally, the promotion is all about selling new glass, and since you need a new body to take advantage of the shutter speed, here's how to get in on it. There is going to be a lot of CPO gear the second half of the year, so keep an eye out.
I love my CCD camera, and I hope I'll never have to part with her. There are times that the CCD is the technically correct answer when using a medium format back (wide angle technical/view camera with lots of movement and old glass). I love the IQ380, to push the sensor so long after some folks have given it up for retirement. I kind of wish Phase would do an Acromatic 80, mostly because I want to do some concert photography at ISO1600, and without the bayer filter.