Jungle Book is certain. There's precedent for worlds cut from one game to be put in future ones (see also Prankster's Paradise). Incredibles is likely as the sequel will be hitting around the same time. Same for Frozen. It's just one of the most successful Disney movies ever, plus there's a sequel coming. Bug's Life is no chance.
Agreed. I think the Incredibles would be a strong fit for KH3 (they're easily the most action-y of the Pixar catalog, and they're very recognizable - less so than the Toy Story folks, perhaps, but still extraordinarily recognizable).
Frozen would be great too - they've got a fantastic built-in elemental theme for your assist character, in fact, not to mention it's specifically a *heart* that gets frozen in the film. It's far, far too easy to adapt it to KH and it's too popular not to do it.
I still think Asgard's a likely Marvel property to adapt (perhaps the only one, since it's the most fantastical fit) - doubly so with the "dark elves" plot element from Thor: The Dark World (they are so, so easily replaced with Heartless in a KH-style retelling of the film's plot). There's already a bunch of talk about moving between worlds and stuff.
I'm more doubtful about Star Wars getting adapted, but solely because it's *too* on the nose (Birth By Sleep especially yanked so very many plot elements from the Star Wars films, not to mention there are characters who pretty much straight up dress in black Sith cloaks and use lightsabers, and I can understand not wanting to draw attention to that). But certainly all of the talk of darkness and light would be more than compatible. Also, Star Wars = $$$$$$$, which is ultimately what the Kingdom Hearts franchise is meant to bring in. If Star Wars were to happen, I'd expect something fairly simple, like Dagobah and Yoda and not much beyond that - it'd keep the science-fiction elements pretty minimal, I think.
