Bonnie Hunter new mystery quilt

I am paying attention to the posted info on Bonnie Hunter's blog for her new mystery quilt. It is set to start in November. I got a heads up on this from Cindy, a friend, who also quilts. The quilt is 4 colors as best I can tell, It is a purple, lime green, aqua and a grey as a common? color. I don't like grey in almost any quilt I have seen unless it was a red/gray Ohio State quilt. Bonnie says you can use the colors of choice... So, I am not sure what I want to do. I just might use the colors she suggested but a black instead of a grey.