K-1's relative silence continues, although there is a rumor of K-1 MAX happening in June or July, we've seen nothing definitive yet. The recent success of the Stand Up Japan event featuring Masato and KID Yamamoto has spawned a lot of positive press and apparently another charity event coming up in July. The Japanese press is all over the main event for the event as it will be a clash between Europe and Japan.
Japanese press have dubbed it "It's Showtime Japan vs. REBELS" with the main event being Giorgio Petrosyan vs. HINATA. Both men are at the top of the heap in the 70kg weight class. Petrosyan is currently the man to beat at 70kg, looking utterly unstoppable with two K-1 World MAX Championships in his possession. At the It's Showtime Lyon press conference Petrosyan mentioned that K-1 has still yet to pay him for his backpay, so there is a slim chance outside of K-1 making it up to Petrosyan, and if they actually have an event, that we'll see him competiing for them again.
So this should be considered a rare appearance in Japan for Petrosyan, against the top Japanese 70kg fighter outside of Yoshihiro Sato. There is talk of European Fighting Network and It's Showtime being more involved with the event, so stay tuned for more news regarding this event. [source]