I think BiS lists are silly for DPS as it is with the combination of Warforged, random sockets, and tertiary stats.
BrM is a different story entirely because it's not like what you're doing can be summed up by one ubiquitous number like DPS. I just posted about this
a few days ago, but really the only definite things are that gear with haste on it is kind of bad, whereas gear with bonus armor is amazing. Everything else depends on what you want to do. All a BiS list would be doing is taking what someone else wants to do and blindly copying it, and that's not even considering the logistical problems of two raids that are 10 ilvls apart releasing at different times and the aforementioned Diablo loot.
I'm sure someone will probably make one eventually, but it won't be me because I think the entire idea is misleading and generally not useful.