Still an announcement nonetheless. Most investors don't follow Micechat so they're blindsided. Let's face it, even they have been completely blindsided or wrong before on rumors. Until Iger or PR say they're actively developing something, it's not law. The Star Wars thing is pretty significant and sets the stage for all the things you mentioned.Yes they have announced studios things.
That Star Wars "announcement" wasn't anything significant. We all know Star Wars is coming and Iger has said pretty much the same thing before. All that announcement was is Star Wars is coming. No details, no location, no time.
Now a Shanghai update I could see them saying something but they don't typically announce new rides or expansions during them.