Rumors are flying about the Tomorrowland Speedway is going to go away for something new. Here are the details from Chipandco.com
http://www.chipandco.com/disney-closing-tomorrowland-speedway-257596/
Hey there guys and gals it is I Anonymouse back with some Disney World Gossip!
It seems there is talk that Disney might be closing down Tomorrowland Speedway at Walt Disney World… The ride is being demolished at Disneyland Hong Kong and Tokyo with possibly closings in Disneylan
I don't know if I would call this as 'confirmed', but it sure seems likely to be announced at D23 this year.
http://wdwnt.com/blog/2017/07/confirmed-tron-lightcycle-power-run-rollercoaster-replace-tomorrowland-speedway-magic-kingdom/