I actually am curious if the M&G will be a Tier 2. It would seem that if they are both Tier 1 they would bring even more crowds to a very congested area. The most efficient way to keep that area clear is to encourage people to fight the mob to get to Norway, do both attractions quickly and then leave. Encouraging people to the attractions on two separate days just drives up the crowd in Norway. The same also applies if you have 2 separate large groups who are required to be there at the same time and then will feel pressure to jump into the stand-by line for the other. It is in everyone's best interest for some of that riders to be pushed to off prime times and do around the same time. I would certainly like that more than making it a 2 day or stand-by only line.
At same time, I am guessing they need at least enough Tier1 to give people a chance. I am guessing Soarin, Test Track, Frozen Ever After, and Mission Space are Tier 1. The rest turn into Tier2.