It's being branded as just a Disney movie, but that doesn't mean they won't play up the Marvel connection.I don't know why this article currently gets a 404 error (or 4-0-Forbes error according to the site), but an article there today suggests that Bandai will the toy company releasing Big Hero 6 toys. Of course, Bandai is well-known for Super Sentai and Kamen Rider toys in Japan, plus Power Rangers and Ben 10 toys in the U.S. I looked for more information, and came across a LinkedIn profile that also mentions Bandai toy releases for Big Hero 6.
What the Bandai toy news for Big Hero 6 implies is that the movie might not be getting Marvel branding from Disney, since Hasbro is the master toy licensee for Marvel products in the U.S. And as mentioned above, if this movie is dissociated from Marvel, it would allow it to be present in Disney's theme parks in Orlando for promotional purposes this fall. It really depends on if this Bandai deal is similar to the Marvel Disk Wars deal where it is for other markets outside the U.S. or if it includes the U.S. market. The phrase "master toy licensee" will probably determine if this will be a Disney and Marvel co-branded movie or just a Disney movie.