Um, that's not actually an official article, GW aren't replacing their entire range (I hope) with just red, yellow, blue, white, and black along with a handy reference sheet. This is just someone cleverly playing with colour theory and GW paints.
I would be surprised if foundation and washes get replaced, the recent picture with the supposed new paints actually had a foundation paint there, as of for the rest, they will either keep the name and colour or will have a handy chart to tell us what new colours to use. Still, I might just put off starting to paint my new Necrons till after this happens. I think it will be for the better, the paints will probably be better, and I'm sure they aren't going to change the entire range, especially not the popular core paints.