Well, as Antanas said, without PBR support...it is not going to happen, and we won't have such nice things. But truth be told, nothing really happens to Corona lately. Let's be honest, since Chaos Group took over everything slowed down a lot. I don't want to get into a debate about this but this is the overall feeling I have and I don't think I'm the only one.
Just look at what V-ray is doing and what Corona is doing.
It really reminds me of the ADSK style when Maya get's all the goodies and 3ds max..well..... :D