PCB revision A is in manufacturing right now (at the moment of writing this post).
As mentioned in the blog post. The revision A will be for development purpose, since it is equipped with different features that will be very useful for Kernel/Basic development as well as apps/game development. I doubt that the yellow version will go farther than that. There will certainly be updates and changes necessary along the way and who knows, maybe the user version might take a totally different form! ;o)
beautiful.