Here is Tony's response:
"It's so funny you ask that because it's something we talk about all the time. We would love to do that. The writers and the producers have kicked this idea around over the last, probably, three or four years. I'm hopeful that it would happen. There's this two-parter... coming up at the end of the new run of shows. I think we've kind of proven that we can pull it off.. This particular episode is really cinematic. It's got all the elements that the audience has come to appreciate about Monk. It just feels like a feature. So the answer is that I really hope so."
Monk's sixth season premiers Friday, January 11th.