I have seen it as well but I haven't read any yet. I am only slightly interested because as of now I feel like we are doing pretty well with our little campaign setting and incorporating random Forgotten Realms stuff right now might be awkward. We talked about originally that at some point we might try and bring in FR. I think I might download it and skim through it and if it's REALLY good then buy it.
Speaking of supplements (I was going to do another post) the Manual of Arms I think it is is coming out soon, I will be getting that one just for the new magic items and stuff, not sure what else it will have but I know its supposed to be mainly a players book