I think Apple would rather use their website and their stores to showcase their products, right there where you can actually buy them.
Short of putting an Apple store in the middle of Epcot, I don't see them having any reason to waste their money on an attraction Disney charges money for guests to gain access to just to feature products they're already selling.
I can (barely) imagine a more abstract sponsorship of an attraction but honestly, even that's a stretch since there is no need these days for most large companies, especially Apple, to promote their brands in that way like there was when Epcot originally opened.
I think you'd see Apple in Disney Springs before you'd see them in a park with this sort of setup. I'm sure it'd be a very busy location - especially the genus bar area.