This is all fine, but if their attitude is "We don't want fans to get hyped for these attractions until we announce a specific opening date," they should be prepared for their longtime and loyal guests to look at other avenues to start building excitement.
I do also think it's kind of rich for them to be so (apparently) upset about leaks when they unofficially provide Robert Niles seemingly the complete plans for attractions like Gringotts years before they open, with the understanding that Niles will share that information publicly. That seems like an odd double standard -- "We'll give you basically a scene-by-scene rundown of attraction X years away, but attraction Y opening in a couple months? Yeah, we're not telling you anything and you shouldn't even be asking."