It is confirmed on the official Detective Conan movie website that the 15th Detective Conan film will be called Quarter of Silence. It will be released in Japan in April 16, 2011 to commemorate the 15 years of the popular detective anime/manga written by Gosho Aoyama (Yaiba).
The story begins with a threat against the Tokyo governor, but Conan's quick thinking prevents any fatalities when a subway tunnel is blown up. Conan learns there may be a connection to a village that was relocated for the construction of a dam, and he races to stop the criminal before the next attack.
Source: ANN
Wow. The franchise lasted for fifteen years and I am still surprised that here in the Philippines, we are still stuck at Season 6 with some episodes skipped!