Personally I’m present.
Future on its own is boring depending where they go with it. If we take this fest as “what will the next game’s theme be” future is the most bland pick. There’s nothing interesting there except “futuristic.”
Past has the most potential as a theme, however I don’t actually expect Nintendo to go all out with a past theme, and we’ve had enough of the Squid Sisters taking over the main story. I love them, but the other idols need some love.
While present is arguably the most boring, it also has the implication that Pearl and Marina can do something instead of being relegated to DLC. (The DLC’s are incredible, but not everyone bought them.) And as it stands, I’m honestly pretty happy with how Splatoon 3 is right now, and I don’t really want to risk losing any of the weapon types we have right now if Nintendo decides to go all in on the theming of past or future.
All that being said, I think past and present are the best options. Future is just too bland.