I don't see what the big deal is regarding these leaks. People who don't wanna know won't look for them, and anyone else'd watch the show anyway, even if they saw spoilers. There were no terrible secrets in the leaks, no "let's secretly screw over the fans" stuff, just... discussion on how to create the cartoon, and a possible timeline. I'm not exactly combing through them exhaustively, but I don't see anything that'd wreck the studio, or their image. The worst I've seen is complaining about Applejack being hard to write for, but they're gonna go to a new generation, so they get to pull her out of the picture anyway.
Heck, the worst leak was the art assets, which happened way at the beginning. Supposedly they had to be secret so no one could compete with Hasbro, which is kinda skeezy, and in reality, the leak just made the company even more popular.
This stuff though? It's just a timeline!