The long wait for a white DSi may soon be over. Along with your equally long, perhaps slightly less agonising wait for a pink DSi.
According to this Toys 'R' Us database listing, both colour schemes—which are already available in Japan&mdashwill be out...well, who knows, since there's no date on the printout, nor on the system that the helpful employee got the printout from.
But if they're popping up on retail systems, they can't be too far away.
Contacted for comment, Nintendo replied with the standard "we don't comment on rumours & speculation" line.