For real though, what's the source on Windy Hill Zone being rumored to return? Is it just one of those fake leaks someone made up and posted without giving us a single good reason to believe but for some reason we discuss anyway, or is there an actual basis for it?
The former honestly. It was in one of the 2 Heihachi "leaks" ("leaks" 2 & 3 here:
https://smashboards.com/threads/smash-ultimate-discussion.434391/post-22235255), but the other doesn't fully elaborate on any other stages except the one purported for Heihachi.
Windy Hill being included in the "leak" isn't why I'm banking on it being true. IDK, it just seems more believable than many of the other "leaks" that have transpired, especially because both give slightly different information yet don't directly contradict each other, merely fill in gaps. Plus the writing styles are totally different.
I'm not discounting it from being a well thought out fake, but I personally think it could be real. Plus, Sakurai has expressed interest in Heihachi in the past, Bandai Namco are developing the game again and a character like Heihachi would be a good fit if Nintendo wants to do a Smash Ultimate reveal at EVO. But again we'll see.