I'm glad they did the brown/bronze scheme. I found the "Onyx was Shockwave the whole time" twist to be the final straw that broke me with IDW1's storytelling. It had been grating on me more and more for a while but that was it.
They can do a IDW blue repaint down the road and that can be Onyxwave. I'll be happy with the version that has a different colour scheme and has some distance from that whole plot point.
I kinda feel this is why they did it. The Copper/Brown one is the real Onyx, while the Blue one will be "Comics Varient" Onyx