I want a Blend4Web PBR tutorial!

Blend4Web is constantly stating that they are implementing PBR - but the only way I seem to be able to do what is basically GLSL shading. GLSL is not that bad, but it’s not PBR. Does anyone know of any tutorials on this?

No-one? I can’t get onto the Blend4Web boards. At the moment I’m not convinced that Blend4Web CAN do PBR, and this may be a deciding factor for the company I work for.