I could be wrong here, but I think I remember hearing that the Principled BSDF shader is set to be the shader to end all shaders 🙂
Take it with a grain of salt, I could be remembering wrong haha!
It’s certainly going to make shading so much easier and take the really technical part out of it. I’m really looking forward to 2.79 (hasn’t come yet has it?) 👌