Guruguru Eigakan will temporarily stop their activities at the end of August, the reason being Amano's health issues (details withheld). He emphasizes that this is not a break-up, but more along the lines of giving himself necessary rest and taking it easy. We might occasionally see him doing other activities in the meantime. The band will do a tour and release a full album before going on hiatus, and each member has posted a message on the official site.
They have my very best wishes. Unlikely, but I hope to make it to some of those shows.