Hmmm... I've not got to read about that 68070 thing but... I did read about the fact that Freescale seems to offer custom-made processor solutions where the buyer specifies the functions he / she wants to see added over the standard feature-set. As I understood it, you could take a 'standard' Coldfire processor and ask for adding instructions, say... the missing instructions that were available on the 68060 creating a more compatible Coldfire processor. And while you're at it, why not throw in some extra features that could make your special system just that little quicker ;-).
But then.. I could be wrong :-S.