Found rice yogurt in Manchvegas the other day.
I've tried the vanilla. Its a bit watery and curdley, not quite as thick as soy yogurt. Not as appealing as soy yogurt and its more expensive, but hey its something.
Plus it has all those loverly good bacteria in it, and would probably be as good of an egg replacer as soy yogurt. 1/4 cup=1 egg