I’m in process on a blog that explains more about this. I don’t have a release date for that, but it’s coming. We want to be clear and transparent about Diablo III’s future. It just take a lot of time and coordination for communication of that level to happen.
For now, I hope you enjoy the PTR and give us a lot of feedback on what we have so we can make 2.6.6 the best we possibly can. 