Not sure where he got black iron.. but the black and white trillium need to both be used to smelt a trillium bar.
Yes, moreover trillium nodes exist in the beta and they drop either black or white at random. So it would be only three new nodes in MoP. Kyparite is in the files but not a single BS recipe needs it; tbh apart from epic recipes that we don't even get to learn from a trainer or anything similar, everything else uses just ghost iron bars. boring