This is my first time watching a high quality video of this trailer. Upon watching it, I noticed something... The green guy, did he look and sound like Kevin Flynn (possibly his program, Clu) or was that just me?

Maybe that's why he knew Kevin Flynn was up there, because he's connected to his user, after all?

I also wonder if it has any connections to the Tron 2.0 game, maybe mentioning Alan and Jetthro Bradley?

Also, I noticed that system programs tend to be red and regular programs to be blue. Green programs, however, were corrupted programs in Tron 2.0. So either the green program in the trailer is Flynn's corrupted program, or the movie has it's own direction and made green programs as users or some such.