The attraction is slated to open up in 2021 in time for Walt Disney World’s 50th anniversary and should resemble the highly-popular current TRON coaster in Shanghai. Expect to see TRON sitting alongside Space Mountain when it opens.
Source: http://coasteraddict.com/disney-confirms-rumor-tron-coming-in-2021/ and https://www.youtube.com/watch?v=2hi3YL3_L3I