Indeed, that's from the Disney Park Blog...
Minutes ago, we shared an exciting announcement many of you have been waiting to hear - Star Wars: Galaxy’s Edge is opening ahead of schedule on May 31 at Disneyland Resort in Southern California and August 29 at Disney’s Hollywood Studios in
disneyparks.disney.go.com
And from the official Press Release page...
wdwnews.com
Which says similarly...
On opening day for phase one, guests will be transported to the remote planet of Batuu, full of unique sights, sounds, smells and tastes. Guests can become part of the story as they sample galactic food and beverages, explore an intriguing collection of merchant shops and take the controls of the most famous ship in the galaxy aboard Millennium Falcon: Smugglers Run.
Phase two, opening later this year, will be Star Wars: Rise of the Resistance, the most ambitious, immersive and advanced attraction ever imagined, which will place guests in the middle of a climactic battle between the First Order and the Resistance and will blur the lines between fantasy and reality.
There is no other way to read this that Phase 1 will be everything but RotR.