Prototyping is taking longer than expected. As for when the actual GB will start, your guess is as good as mine. I was hoping we can start taking orders by the end of Nov. We'll see how this round of prototyping goes. I'll probably have some pics soon.
As for the top plate colors, there will be many. As long as MOQ (20-30) is met any reasonable color can be done (no white). black, silver, red and probably blue will be made regardless.
Another thing I should mention - this keyboard will have a pretty solid weight to it. It will probably weigh as much as typical non-angled full alu boards like KMAC1.