This Tron Legacy poster is not official by any means. However, it's impressive and splendidly evocative of the franchise's 'neon' trademark.
The poster was designed by artist James White, who has worked for such clients as Toyota, Armada Skis, VH1 Latin America and MTV. See the original poster on James White's website here.
And for those of us who grew up in the 1980s; here's the original iconic Tron poster as seen in the hit television series Chuck.