Well, I was in Tokyo during 19 April to 25 April. So yea, I definitely watched this in cinema on the very 2nd day after its launch. So since the movie has been released, I guess it won't be that much of spoilers if I spill a bit?
AND most importanly, and as usual and the end of the movie, Detective Conan Movie 19 is coming April 2015. This shall put off all those rumors.