According to The Hollywood Reporter, David DiGillio is writing the sequel to Tron: Legacy.  The original writers, Edward Kitsis (mistakenly called Adam Kitsis in the article) and Adam Horowitz, are busy with a project for the ABC television network and are currently unavailable.

As I mentioned in a prior post, despite its marketing costs, Tron: Legacy has pulled in around $400 million dollars worldwide, which was the highest gross for a first time filmmaker (Joseph Kosinski) ever.