I think it might come January of next year. I mean following the production pattern:
Detective Conan: The Time-Bombed Skyscraper 1997
Detective Conan: The Fourteenth Target 1998
Detective Conan: The Last Wizard of the Century 1999
Detective Conan: Captured in Her Eyes 2000
Detective Conan: Countdown to Heaven 2001
Detective Conan: The Phantom of Baker Street 2002
Detective Conan: Crossroad in the Ancient Capital 2003
Detective Conan: Magician of the Silver Sky 2004
Detective Conan: Strategy Above the Depths 2005
Detective Conan: The Private Eyes' Requiem 2006
Detective Conan: Jolly Roger in the Deep Azure 2007
Detective Conan: Movie 12 2008
Makes logical sense