UPDATE – MSG is being released on the 1st December 2016.
As of right now the only release information we have for Mean Streets of Gadgetzan is ‘early December’.
I will update this post the moment the exact date is released. It’s typical of Blizzard to be a bit vague when first announcing a new expansion, so keep your eyes and ears open.
You can check out how much the pre-purchase packs cost here.