What is the system that is going to replace Directional Specular? Will the new system work? Will it work in WebGL? Will it produce spectacular highlights in baked lightmaps?
It’s being replaced by a new light mode system, and it’s VERY good so far in my opinion. It fixed many problems we’ve had with mixed lighting, and allows for specular lighting in baked lightmaps. You can try it out for yourself here (currently experimental and only built with Unity 5.4):