On the other hand, the CUSA stuff is a total disconnect. Other than branding, there's absolutely nothing (at least nothing that has been publicly shown) to connect it to the Amiga or earlier Commodore machines.
How do you figure? The C64x is physically a twin of the earlier C64. The Amiga product has not been released so we really don't know. If the Amiga product has a true emulation layer, it will have the same heritage as AROS, OS4, MorphOS etc.