Thank you for your response, @TheJamsh, but is not linked to OpenGL 4.3, as far as I understand from the answer, just “there are no plans to expose support on OS X right now.”
As concern reflections on transulcent materials, I understand the current implementation is linked to the Shader Model 5 render path, but since there are many other older game engines (e.g. Unity) supporting translucent materials with reflections on OSX, I would suppose there are ways to implement this without OpenGL 4.3, and if so I’d like a fallback for OSX to be added in the wishlist of the roadmap if possible. Glass is almost unusable without reflections, and this is a real bummer for architectural rendering.
Does this make sense? In any case, a clear feedback of what is really impossible, and what “not currently planned” would be very appreciated.