SHENANIGANS!
As if we already didn't know, my sources confirm that the person who says they work at Scholastic and read DH is just a craxhead. That manuscript is locked up tighter than Fort Knox and anyone leaking anything would be fired, flogged, and sent straight to Azkaban where they have to share a cell with Snape when he goes down. You don't want to be Snape's beyotch.