Well, sort of.
MacOS X could be run (via MOL) if it wasn't for Apple's EULA. Personally, I could live with that, because if I spend the money to buy MacOS X, I'll run it on whatever I bloomin' well like.
MorphOS is another matter. We still don't know if it will run on the BIOS Hyperion are said to have "fixed", and we don't know if it will be made available for sale on its own (i.e. not tied to a Pegasos system).
Thendic have said AOS4 will run on Pegasos, but unless things change that would have to be a pirate version, which is unacceptable from my PoV.