Tomorrowland has been undergoing a lot of smaller changes recently, ahead of the arrival of the TRON Lightcycle Coaster that is currently under construction, and will be opening in 2021.
However, to accommodate the expansion of Tomorrowland adjacent to Space Mountain, Disney
So from January 2nd, 2019, the petrol fumes will disperse, the cars will come to a stop, and the Tomorrowland Speedway will be unavailable until Summer of 2019. As this 6-month long refurbishment will see a slight alteration to the current track layout of the Speedway; however, it’s important to note that the Speedway will not be going away for good, but instead it will be reopening later in the year.
Unfortunately, though, Disney has previously stated on Disney Parks Blog, that this refurbishment will not see any thematic changes to the Speedway, as have been long
Tomorrowland at the Magic Kingdom is still one of the top priorities ahead of the 50th Anniversary celebrations in 2021, so other minor changes and maybe some new announcements are still expected in the coming years.