Kojima game(s) cancelled?

Yesterday Metal Gear Solid creator, Hideo Kojima, tweet about a project he had been working on for almost a year becoming meaningless, he also said that he can't stay positive something that is really weird for Hideo since he's one of the happiest man in gaming industry. We hope that he isn't sad about something related to video games but if he really is because of a cancelled game we want to say that whatever he was doing it was going to be a masterpiece like all of the games he has made so we are sorry for him.