WDW News Today reports that the Tomorrowland Speedway Track in Magic Kingdom is undergoing major construction – reconfigured in preparation to construct the new TRON roller coaster slated to open in 2021.
See the WDW News Today article here: https://wdwnt.com/2019/01/photos-tomorrowland-speedway-track-ripped-out-during-construction/
There’s a good view of the Speedway from the Tomorrowland People Mover – if you want to catch a glimpse of the construction, try riding the People Mover the next time you’re in Magic Kingdom!