Take into consideration this could be a marketing ploy, take it for what its worth on the one hand we have every single thing they release they get panned into the ground. So as a idea if they have a "leak" they can test the water before committing to code they can also see how well received it would be before pushing in they direction.
To me this leak is a intentionally test to see how well a new idea would be received which is why nobody has been fired for it.
The rest of the things are also there to give it credence as to get everyone talking about it. Look at it this way the things that have been announced were coming anyway and the Ghostbusters tie in would have been negotiated ages ago so would have been decided as is planet zoo.
Just my input into this discussion and gives you guys something to think about