[1.2.300] New Class?

Always thought that said "sent for design". I doubt kms would ignore that though

Where would it be sent to if they already do that in their HQ?

I think they might just because of the expansion of Masteria isn't their priority. This is just a guess, but I think KMS designs everything for all versions, then each version can do whatever they want with it (HP/XP/Damage/Boss). I understand that these are all my assumptions, but it would explain the delay of Masteria.