Prestory: Monk to Return to TV in 2-hour Movie
Note: I do not know if this is a confirmed news (actually, it's not!) So beware, while reading.
I hate to be the bearer of bad news, but the Monk movie is not gonna happen. According to Monk writer Hy Conrad, "There isn't going to be one. USA paid for Andy to write two scripts. The first, where Monk gets married and goes to France, only to have his new wife try to kill him, got shot down for creative reasons. It seemed like too much of a departure.
The second, "Mr. Monk for Mayor", involved Natalie and Stottlemeyer but not Disher. Molly has become an investigative reporter like her mother and wants to expose a scandal at City Hall. But the only way to get that information is to get inside the mayor's office - hence Monk's decision to run for mayor.
USA crunched the numbers and decided that to film the movie and then to promote it would cost about 6 million and that it wouldn't be worth it. Andy is onto two new projects, an hour-long mystery series about twin brothers, one of whom is supposed to be dead. They wind up both sharing the "living" brother's life as they solve crimes. Another comedy mystery. His other is a half-hour comedy with Dana Carvey. Both are in early stages, so anything can happen."
Source: USA Network Forum