If im not mistaken the coldfire series are intented for handheld devices. Its been a while since I checked the specs last, but I think remembering something about 300-400 mhz and a instructionset that was smaller than the one for 68000.
The 68xxx emulator in os 4.0 (I think its called petunia or something) is said to be able to emulate an 68040 at 200-400 mhz on a G3 machine if I remember it right. So I think Ill save my money for the amigaOne
Its sad though... We could really have used this accelerator 5 years ago