First raid boss test is going live tomorrow.
If the raid is smooth enough to actually get some gameplay going I suggest you tune in on a stream.
Personally I'll be streaming the raid from Disc Priest PoV.
Obviously as this is the first raid test of legion, expectations should be set very low. Expect the raid to be laggy, and the boss to not work.
I'll happily give my opinion on the Legion Disc Priest along side the stream if you tune in.