Here's the good news: a Tron sequel is still in the works.
Here's the better news: it will no longer go by the confusig name of Tr2n.
Now, here's the bad news: the movie will instead be called TRZ.
That seems even more confusing than the original idea. Meanwhile, initial plot details for the film have been released:
“After being transported into the surreal landscape of a mainframe computer to destroy an intruder (Tron), a programmer finds himself allied with the leader of a rebellion against a corrupt cyber-entity.”