> I wonder, for instance, if our registration keys will still remain valid > for MorphOS 4.0 and above.
Most likely not as there is no way for the MorphOS team to clearly identify the current legit license owners. Imagine person A sells his PPC Mac including MorphOS keyfile to person B but doesn't delete all instances of the keyfile after the sale. If the old keyfile remains valid for new MorphOS/x64, person A will be able to register an x64 board for that (if he does so before person B does) although he is not the legit license owner, especially if person B did not ask the MorphOS team to change the keyfile owner's name.
