In terms of the game changer bit, the most important part is the price, which of course leads up to a 44x33mm sensor. Hasselblad is for the first time interested to provide the masses with medium format cameras, and comes with a price that makes it quite possible. It's not as cheap as the 645z (yet), but it's a whole lot sexier to the general public. If Hasselblad succeeds with this new volume model, maybe in the longer term also the H system will come down in price.
Many would have liked 54x41mm 100MP full-frame at $9k, but it's just not realistic. Manufacturing cost wise it might actually be these days, but you can't just put the highest end sensor in there in their consumer product.
This product is not primarily aimed at current MF owners, but to those that look at buying say Leica SL or A7r-II and want something beefier. It will attract some current MF users too I think for sure, but I expect a bit more consumer-like UI and lacking some features pro users would want.
I wonder if the camera has a focal plane shutter. Unfortunately I think it won't have which makes it much more limited than the A7r regarding its use on Actus/Universalis, and then we'll probably not see a metabones adapter to run the TS-E lenses, which otherwise would be really cool.