On April the 9th at midnight (Japanese time), a special site of PIERROT appeared suddenly on Internet. The site just has a black image, with written on it:
Shinjuku Alta Vision
For now, no more informations are available. Shinjuku Alta Vision is a popular building in Shinjuku that has music stores and restaurants, with a big screen on its front. 8 years ago, PIERROT announced their disbandment on the same date, so the mystery is full, but everyone is hopeful for a comeback. The question will be answered in 3 days!