I have no idea if the coldfire uppgrade you're talking about requier the latest ROM or not. Since it's still not available you need to contact the manufacturer if you need specific information. Concidering WB3.5/3.9 requier ROM3.1 and it being likely you want to uppgrade your workbench with the new hardware in hand, and considering the price of a ROM3.1 for an A1200 is as low as it is you better just get it over with and purchase those ROM's.