An art deco theme can be thrown on any building, it doesn't have to affect what's inside it. If they are truly going to have "dining and entertainment" I think there are three ways they can go with this.
One: Character Dining. This park doesn't have a character meal, which is a huge money-maker for Disney. Problem is, what characters? They'd have to bring the Grinch out of mothballs because otherwise the pickings are meager: The Minions, SpongeBob and The Simpsons (a whole new land and they get TWO new characters???). They aren't going to have dinosaurs or Transformers romping through here, and I don't think families will get excited by the old-timers like Lucy or Doc Brown. And I don't think they can have the Monsters scaring the bejeezus out of kids either. Not that it wouldn't be awesome, but THINK OF THE CHILLLLLDREN!
Two: Dinner Theater. This COULD be a possibility, but what show? I think we can all agree this is going to be a sit-down restaurant, so how does this work? Shows start every hour and they clear out everyone before the next show? And, again, what show? I can't come up with anything for this one.
Three: IP Dining Experience. What this could be is anyone's guess. I know Universal went after The Hunger Games avidly, and then it all died down. Does that mean they gave up or they got it and something is waiting in the wings? I tried hard to think of what a Hunger Games theme could bring and I couldn't get past all the killing. SO MUCH KILLING! The ONLY thing I came up with was a dining experience. While the movies don't go into as much detail about the food, the books certainly do. But where would the entertainment come in? Would the dining room be in the Capitol and everyone working there would look like all the weirdos that live there? Would it be attacked every 45 minutes by Katniss and company? Maybe it's a Capitol restaurant post-war, and we District people have been invited in for a Capitol feast? Or would you be in a train car, where much of the eating is done in the books, and you would see stuff happening outside the window? I did have a thought of sitting there while television coverage of the Hunger Games played on screens, but we're right back to kids dying. Of course, there are other properties out there, but I don't see other ones Universal has chased - Star Trek, The Hobbit, Kaiju, World of Warcraft, Nintendo - becoming such narrow-focused projects. Those are all properties that scream RIDE or LAND, not DINING EXPERIENCE! Meanwhile, I can't picture a single Hunger Games attraction that doesn't involve taboo subjects of kid-killing and war. THINK OF THE CHILLLLLLDREN!!!
Of course there was the rumor of them building the Hogwarts Great Hall dining room, which would be a GREAT idea. But I don't see how it could be allowed to be all the way over here. To make it work - AND get it past JK Rowling - you'd have to actually enter Hogwarts first, and then head to the Great Hall. It's a HUGE building, so where would it go if not over here? (And I just can't picture any way to get there - even via walkway all the way from Hogwarts and over the entrance area path - that would please JK Rowling.) So it will HAVE to go near Hogwarts. Which means they're probably planning on TWO sit-down "dining experiences". (And none of us should be shocked knowing how much focus Universal puts on dining establishments now.) Hogwarts appears to hug the back of CityWalk so IF they build this - and they'd be stupid NOT to - it appears it can be built from the edge of Hogwarts along the back of the WaterWorld stage between that and Hippogriff. Or they can use the old Gibson Amphitheater path, which is about 150 feet from the old gate to the edge of the construction area, which is how long I think the Great Hall would need to be, though that doesn't allow for the kitchen or the waiting area (the Entrance Hall?). Both would allow for access to the WaterWorld stage (for the eventual Harry Potter replacement show), but it would be easier to hide here as the other location would need a lot more facade work. Plus it's going to be VERY TALL (unless they dig down a bit). So if they could build it at ground level on the old Gibson path, they can build whatever they're building across the way and bridge them with a shared kitchen. There are indications that the "dining experience" may be on the second floor over there, so this isn't completely ridiculous. And this work inside Cartooniversal is puzzling. If they are building up the support structure, it's getting a second floor. Yeah, it's at least 90% likely that they are just reworking the insides, but if this were my park and I had to deal with the space issues, I'd definitely look at places I could build UP.
Just some loooong thoughts.