If Dixie and Monster Hunter were truly cut, I think there is a decent chance Incineroar was also cut at some point. It's also possible that he was just leak bait all along. Or Vergeben was a fraud all along. Or some of his sources were right and some were wrong and he couldn't tell the difference. We may never know. Actually, we probably won't know the answers to many questions we now have. But I have some more questions.
Dixie being cut implies that she was more than just an echo. Echoes (or clones) seem, if anything, to be (somewhat) easy roster padding. They've managed to squeeze last minute clones into previous games for that reason. If Dixie was an echo, you'd think they could have made it work within their time frame. Or perhaps they decided they wanted to do echo sets with DLC and decided to hold her off for DLC to save crucially valuable time last minute (this option seems less likely).
I love the mind**** of Mach Rider, but at the same time, I have to ask... why Mach Rider? Yes, I know, characters don't "steal" slots from others characters, but they could have squeezed in one more massive fan-favorite instead of a random retro character that has middling interest. Yes, those characters are traditionally and almost expected at this point, but to think Mach Rider was worth spending crucial developmental time on instead of just ONE more character seems odd. Yes, I'm talking about the most wanted character from Nintendo's second biggest original franchise. Skull Kid. Why can Zelda not get a rep that isn't of the Triforce trio? Yes, even if they didn't make Mach Rider, it isn't at all guaranteed that Skull Kid would have been the one that benefited from the extra time - but surely he was close to the top. Now that Ridley, K Rool, Banjo, Geno, and Isaac are out of the way - who else could be in the top 3 most long-running fan request characters that are still strongly wanted for Smash? Surely Skull Kid is top 3 in that now - possibly number 1. So there is a case to be made that he could potentially have been next. Especially when many of the signs that pointed toward Shadow and Isabelle also pointed to Skull Kid. Again, I adore that Mach Rider is in, but I am confused by it none the less.
Sora announced as DLC the day before Smash is released? Yes please. I hope this is true.
Lastly, the idea of Skull Kid VS Waluigi fighting to be crowned the #1 fan requested character from the community is enticing.