Everything points at the initial guess, 44x33 mirrorless system. I think it's a product aimed at a fairly broad consumer market, so I wouldn't expect anything odd (like range finder, panoramic/square sensor or moving parts), just an A7r but bigger, or perhaps more looking like Leica SL. Leica SL is there because the M isn't modern enough to attract a broad market, and I think it would be a mistake by Hasselblad to try pulling off anything retro.
It will probably be mountable to Arca/Actus, but I would be most surpised if any of the tech cam use cases have been considered at all, just as with the A7r it will work as a natural side effect of the mirrorless design. I don't think the product's target audience is professional photographers that's been long in medium format, but rather to consumers (or "prosumers", although I hate that word) used to high MP 135 cameras that want something bigger and better. It is in line with the comments we've seen from the company.
The A7r-II is $3.2k, Leica SL is $7.5k, Pentax 645z $7k, CFV-50c is $10k. What will this camera cost? My bold guess is $8.5k, and then I think I'm approaching the lower limit of what's reasonable to expect. But I don't think it can be too expensive if they intend it to be aimed at a consumer market and be a "game changer".