I believe Tron pinball will be reintroduced as the 1982 version not Legacy. They can update the artwork package to reflect it with keeping it the same physical game layout. If on SPIKE or whatever platform at the time, I'm sure they will have a larger LCD display etc. This would also be a great way for them to have 3-4 tiers of this model Home Edition, Standard, Premium, New Limited Edition. I agree with another poster in this thread that the timing of this would make sense for it be introduced right around the same time as the Tron Coasters in both Disney Land & Disney World's (50th anniversary which would be 2021)

I'm going to say 2021 for Disney World's 50th is when we will see Tron's on the Stern line again (albiet likely a new/old '82 version)
It's also possible that it could be in 2022 as that would mark the 40th Anniversary of the original film. (which would be the Comic Con release of summer of 2022)

It's also been mentioned that Disney's Tron Legacy wasn't that well received especially in terms of earnings however they have lots of movies already in the pipe line from Star Wars, MCU Phase 4 etc... Who knows Tron 3 could still happen. I'm going to say in some shape or form a Vault Edition or revamped Tron some type of Tron will happen in 2021 or 2022.

2020 December does mark Legacy's 10th Anniversary.. which would be the "Holiday season pin" next year.