After a lengthy 5 month refurbishment, Tomorrowland Speedway is open once again at Magic Kingdom. According to sources, the track was not changed much, just shortened.
This had to be done to make room for the new TRON roller coaster.
The speedway which opened in with the Magic Kingdom has went through many changed over the years. It was known as Grand Prix Raceway until 1994 when it was changed to Tomorrowland Indy Speedway until 1999.
It has been shortened many times as well, most significantly prior to the opening of Space Mountain.