Update: Deadline reports that McDonagh's next movie will star his In Bruges leads Colin Farrell and Brendan Gleeson, which makes me very happy, not only because I speculated correctly, but because those actors are clearly great together. Deadline also adds the filming will be this summer, so there's certainly a chance the movie could be ready by this year's festival season. Original story follows below. Martin McDonagh had a breakthrough year with 2017's Three Billboards Outside of Ebbing, Missouri. The controversial movie ended up picking up Oscars for Best Actress (Frances McDormand) and Best Supporting Actor (…