The Hyper-Kamiokande (Hyper-K) project has an extremely rich physics portfolio that spans from the study of the CP violation in the leptonic sector and neutrino mixing parameters to proton decay, atmospheric neutrinos and neutrinos from astronomical origin. It is supported by both the HEP and Cosmic Ray communities.
The Hyper-K collaboration is currently composed of members from institutes coming from 13 Countries in 3 different Continents.
March 12, 2014: Hyper-Kamiokande is one of the top 27 projects (out of the 192 submitted) selected by the Japanese Science Council in the "Japanese Master Plan of Large Research Projects". Details (in Japanese) here.