I would think that once Dice gets reprinted, the cards will be printed in color, since that's what Andrew said
here. Please remember, if something is Munchkin and OOP, that doesn't necessarily mean that SJG won't ever reprint it, but it certainly means that SJG hasn't gotten around to reprinting it yet. Unless, of course, someone can point to something I've missed where Andrew, SJ, Paul or Phil said that Dice is dead. . .