yup, the article says the "Sunset Showcase theater" which is the spot where they were running Club Villian near R&RC. I suspect it is slightly more than a M&G, you don't call it a "show" if it's just a M&G.
It's good that Disney seems to be realizing they are going to have to put some stuff in DHS for 2019. I could see them doing some other low cost revamps in the park as well. (Maybe time to update/replace B&tB and VotLM?) Can we assume Launch Bay becomes something else as well? Doesn't seem to make much sense to have a lame Star Wars thing once you have a cool Star Wars thing.