As with a lot of recent game announcements, it seems like there's kind of a mindset/realization that the home console market is in trouble so now is the time to do let out the big guns and see what happens. Horii might also realize he' and especially Sugiyama are getting older and decided to just make the game he personally wants to play while he still can.
Well, I was more talking about the eventual sceario where the game is only on home consoles (PS4/PS3, or just PS4), never had anything against PS4 getting it, I was expecting it anyway. But just PS4 seems to be way too risky. That's why I'm expecting another SKU (a handheld one, probably NX at this point) to appear in the future. But your last sentence about Horii and Sugiyama's age...how old are them? O_O