He had done more toned down, themed shows (non-theatrical VisualLives) before (and after?) YFC; Drug Party, the School-themed one that I can’t remember fully what it was called were the bigger ones. The past couple year’s he’s been doing slow/midtemp shows “Last Songs w/ K” (a pianist), so he’s no stranger to non-theatrical shows.
He actually mentioned that he was thinking of reviving YFC some months ago; it looks like he decided to move forward with it. His voice does seam to be fully back and he’s been settling back into his usual workout and such routines, and it was said that he was coming back into his career gradually, so perhaps this is more of an extension of ‘getting back into it’ type of thing? 
@Kumanosuke Were you at any of the shows?
I remember a lot of stories from that tour about the MC’s lol That’s Gackt for ya.
I do wonder though, if it’s kind of a ‘missed the boat’ thing though, for him to tour outside of Asia now. I mean, he was one of the biggest and most wanted artist to tour back then and he didn’t, other than with YFC (though, I remember people being excited for YFC and generally liking YFC more than not). And there seams to be a lot of negative hate on him by the newer gen of jrock fans for mostly reasons of that’s a popular thing to do now (because he’s so, eccentric, different, weird, whatever, ect) so…