Hi -
Thanks for your interest, I'm excited about Copperhead as well, but there's a lot of work yet to be done. I don't currently have a roadmap for a stable release. I am planning on pushing a big update to the code in the next 2 weeks, which will make Copperhead better in a number of ways, but it still won't be stable. I hope to come up with such a roadmap during this summer, but I don't have anything concrete as of now. I'll email the list as things progress.
Thanks,
bryan