It's basically a marketed soft opening, without the dark ride ...
And not sure why folks keep panicking over M&MRR ... just because a date hasn't been announced ... do people forget May 1st is the park's 30th anniversary? (Maybe you know, standing in front of the theater, they, you know, say something ...)
The opening date could easily be published on the Disney Blog ... we're still a ways off from August 29th everyone
I feel like they've learned a lesson or two not announcing dates so far ahead of time anymore. It's basically an info drop and here ya go, a few months out.