WDWNT.com is reporting that The Great Movie Ride is expected to close in 2017 or 2018 with a new attraction called "The Great Mickey Ride". The story was later confirmed by WDWMagic.com users Lee and marni1971.
The ride would mark the end of the brief sponsorship of The Great Movie Ride by Turner Classic Movies and according to the article it is expected to be a trackless ride built for both Hollywood Studios as well as the Disneyland Resort in California.
The expectation is that it will be inspired by the classic Mickey Mouse shorts and utilize the trackless ride technology.
Our full rumor tracker for this can be found here.