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I am assuming that the concept art was done by Daniel Simon as he was rumoured to be doing it back in February - check out that post for some more amazing artwork.
The trailer from last year has now been released in HD so have a look at the new light cycles in action. Stunning.
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Source: AICN
/film also had a description of a scene shown at Comic Con and it sounds pretty good. It is outside the computer world:
The scene involved Kevin’s son being told in voiceover that someone received a page from his father’s old office, which has been abandoned for over 20 years. Flynn’s son shows up on a motor cycle. Flynn’s arcade has been long abandoned. He opens the door to reveal a room full of arcade machines, all covered with sheets. He inspects the old shut down arcade, and it is clear no one has been here in ages. He switches on the power and all the arcades turn on, as does a jukebox, which is playing retro 1980’s music. He goes up stairs to Flynn’s old office, which also looks untouched, everything covered. The next shot was kinda magical. He walks down an isle of games which ends with the Tron arcade game. He uncovers it and we see the retro 80’s graphics. He sticks in a quarter but the machine rejects it. He pulls out the machine to take a look at the back, and discovers a secret door. He opens the door and enters the darkness. Cut to black.HOME