While not in the MK, they do still have the rat ride to hype.
But the original info comes from a vendor on the project who was told by the general contactor. Then Steve (WDWMAGIC'S Owner, reliable source) confirmed the info. So I'm taking it as mostly true. Of course things can and do change.
Martin's only comment on it was, "Guardians for EPCOTs 40th anyone?"