Here's the first of the 2 TR3N (TRON 3 ) teaser videos. This one is titled "The Next Day", and is an official exclusive extra from the TRON: Legacy Blu-Ray.
It explains the origins of the Flynn Lives organisation (who ran the ARG) and who was in charge of it, and what happens after Sam decides to take over ENCOM at the end of TRON: Legacy! Featuring the fabled scene with Dan Shor as Ram and Bruce Boxleitner as Alan Bradley.
The second TRON 3 teaser is reportedly a hidden Easter Egg in the DVD/Blu-Ray and will reportedly feature Olivia Wilde as Quorra and Cillian Murphy as Ed Dillinger Jr