Fender doesn't make ANYTHING in the current system - it's just a marketing agreement to put their name on it. That's it. Theoretically they collaborated in tuning it, but I'd be surprised if that even happened. The head units are made by a whole bunch of different manufacturers (Panasonic, Delphi, TechniSat, and others). The amp is made in China by ... I have no idea who. The "Fender" speakers have different part numbers than the base system speakers, so in theory they are an upgrade, but no idea who makes them, other than it ain't Fender.
H/K at least makes stuff, but that doesn't mean it will be any better. Our Kia Soul has the top audio option which is branded H/K. It sounds like hot garbage.
Based on the other cost cutting we've seen already on the Mk8, I'd be shocked if the H/K system is an improvement over the current Fender setup.