What would you guys who actually played and raided at Beta think the optimal raid setup will be? (10man)
Is there any classes/roles you just have to roll with in your 10man? Ofc it's hard to tell so early but still
You'll likely stack hunters, as they can do full dps at range while moving. Many of the Mythic fights are looking to be absolutely insane movement-wise, I'm talking Siegecrafter heroic levels of insane.
Thinking Mythic raiding will consist of 2 tanks, 5 healers and 13 DPS which will most likely be 8 ranged and 5 melee. Many of the fights will rely much on moving as it looks right now, which would benefit hunters more than others.
For 10 mans, or Flex, I'd say the raid composition likely won't change much.
There will be no such thing as optimal setup as Normal/Heroic are now flexible. Your 10man group can just add an extra ranged/melee/healer to become 11/12/13 whenever you want. You can go all the way up to 30. I believe you can even go down to 9.
Mythic will likely be as Lemmiwink says probably worth having a melee with offtanking skills and a ranged with healing, So you can move to 3 tank or 6 Heals if needed.