Nearly 20 years passed between the first and second Tron films and, at this rate, it may be the same between the second and third. Rumors began swirling in earnest today about the long-rumored Tron 3, and while they may or may not actually be true, we’ve learned over the past decade not to get our hopes up.
Source: io9 – A Brief History Of Tron 3 Not Happening