Correct me if I’m wrong, but no official opening date has been set or announced by the Disney company, correct? And I don’t believe the CEO being quoted as saying June counts as an official announcement.
If Rise of the Resistance wasn’t ready, maybe that they could open without... but this whole land was sold to the public with the “You get to pilot the Millennium Falcon” tagline. If it’s not ready, the land isn’t ready.
Now, of course, I’m not saying they couldn’t “soft open” the rest of the land and the other ride in the weeks leading up to it if it’s all ready, but it would be a bad business decision to announce an actual opening date (month and day) and not have the one attraction people know about not be ready on that day.
OMG the image they used in the FB group is perfect though. I love it!