Sorry for bad Translation. I am Korean, but I lack in advanced vocabularies.
Here's the original text:
명탐정 코난 극장판 제 15기 - 『침묵의 15분』의 극장 개봉과 동시에 차기작인 16번째 작품의 제작이 결정되었습니다.
16기의 예고영상은 코난의 16탄 제작결정! 이라는 멘트와 종합 운동장같은 녹색 잔디와 함께 조명이 비추어진 영상이었다고 합니다. 이로써 추측해보면, 16기의 주제는 축구장같은 운동장과 관계가 있다고 생각됩니다.
그리고 코난의 배급회사 토호에 의하면, 3년 연속 흥행수입 30억엔 추월을 목표로 하고 있으며, 만약 30억엔을 돌파하면, 시리즈 누계 흥행수입 400억엔을 돌파하게 됩니다. (14기까지 누계 흥행수입 371억엔.)
Translation:
While the Detective Conan movie 15-Quarter of silence was released, the production of next Detective Conan movie 16 has been determined.
The trailer for the 16th movie, Conan's decision of 16th Production!, showed a Grass-field stadium was illuminated with light. I'm guessing that the 16th movie will be related to a Soccer Field.
According to the Conan's Distribution Company Toho(?), the box office receipts(?) aim to overtake 3 billion Yen for 3 consecutive years, if they do, then the total box office revenue for the series will exceed 40 billion Yen. (Total box office receipts until 14th: 37.1 billion Yen)
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According to the comment, most likely it will be another case about a bomb placed in the stadium. It also says that it can be Kochien Baseball stadium (instead of Soccer field) as well.
Though, I'm nt so sure that this is for real, but this is from Korean Detective Conan fan site called KudoNet™.
Link:
http://www.anifocus.com/aflegacy/zboard/zboard.php?id=kudoNews&page=1&sn1=&divpage=1&sn=off&ss=on&sc=on&select_arrange=headnum&desc=asc&no=1009