I think it is safe to say we all jump on rumors about DHS because the park needs some help. We have heard the rumors about new "worlds" being created to more match Universal. There has also been the rumors/news of seeing Imagineers walking around the parks as well as stories of executives in the park. And then of course Disney went and bought out Lucas and now have free reign with his creations.
So i think it is safe to say things will change at DHS whenever either the right plan or fiances are in place. They are not going to dump money into the park unless they know they will make money off it. Contrary to what we like to think Disney is trying to make money, not make dreams come true.
So what will happen? Who knows.
Is there land available? Yep, lots of it. Take a look at Google maps at the area. There is several areas for either expansion or options for remodeling/demolition. You have parking lots and woods to the east, southeast, and south of the park able to be used. To the west and north you are blocked by roads, but reworking of the park for flow could be done and tweaked by what you do with the Backlot and LMA.
So here is what I would do...because no one asked.
Echo lake and surrounding restaurants, leave them. They work with the "hub" being part of Hollywood's Golden age. Improve on this. Mainstreet has not a single ride at MK, but is a blast and filled with eye candy.
Develop more Star Wars now that they own it and do not have to deal with George. Turn the Back Lost Express by ST into the Cantina, complete with repetitive music from movie. Remove Jedi Training and create a new road with a new Theater area for Jedi, a new kids friendly ride (perhaps a SW version the Astro Orbiter) and build half of the Deathstar with a coast inside to be the center point of this land ala Space Mountain. Inside you will find a dueling Lightsaber Coaster (see idea for the dueling dragons coaster was proposed at AK). Imagine two coasters in pitch black, one red and one blue/green that go at the same time and intertwine and near miss each other while epic saber fight music and sounds occur. Heck have two separate lines (Sith and Jedi) with separate FP that allows guests to choose their own path complete with a different interactive line. Also, since this is a Studio themed park, add all sorts of props and such to the area. Bring up the snowspeeder from the Backlot tour, and other SW stuff to display. Add a Hoth icey playground where one can cool down in the summers.
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Pixar Place, and say no to Carsland. Pixar, Disney Animation, Hollywood Golden Age and SW should be the center pieces to this park, but again keep it feeling like a studio. So have the Streets of America merge into the Streets of Monstropolis, which at the end of the block could have either Monster U or Monsters Inc. with a ride. Which would go north on the back edge of the park by LMA and Catastrophe Canyon. Again make it like a movie set just one based in the monster world. They could even create artifacts from famous monster movies that could be displayed. Honey I Shrunk the Kids? Now a Bugs's Life play area. Move the AFI show case to where Idol and Sounds Dangerous is and knock down the rest of the backlot tour for more Pixar attractions. Add studio versions of a few of the Carsland rides included RSR, but make it look like a movie set. This is Pixar Place, not Carsland. Move Mater and Lighting M&G into the new area. However, create animatronic cars that can interact with guests. It dumb to get your picture taken next to two inanimate objects.
I would then push back in the Art of Animation area, to add a simple dark ride involving the history of Mickey and allow to tell the Disney story there. This area could also be used to promote the latest Disney or Pixar films with special, limited time exhibits. Exhibits are cool if they get switched out from time to time.
Finally throw more Hollywood into the park. Add a Disney wax museum, filled with famous Disney scenes, both live action and animated. Work with other Hollywood agencies and organizations to bring more historical exhibits and attractions for the public to see so we don't have to go to Hollywood. And for pete's sake, add the Hollywood sign, complete with Mickey ears somewhere.
Okay those are my ideas. And to keep it rumor, a bus driver told me they were going to do all of it.....