Generally, I set Robin as the CPU if it's in training mode, due to Robin being exactly middle-of-the-road in terms of weight, so they're good to lab combos with.
Sakurai was kind of vague about it, only mentioning it in passing, but it's definitely a possibility. There are four ways it can go:
The starting roster is the original 8 for 64,
The starting roster is the less-original 12 for 64,
The starting roster is a random, or otherwise decided, 8...
I don't remember who said it, but it seems like they're basing a lot of their decisions based on the Brawl ballot, rather than Smash 4's, meaning the last one was for 4. Bayonetta certainly wasn't the number one, but we can't really expect them to add Shrek anyway. To say that nobody wanted her...
I don't actually believe that there is a 'heroes vs villains' theme at all, or that characters dying in trailers are linked. I think the TV cutscene for K. Rool was just to show how the other series all have villains and to introduce him, and I don't even think people would be saying that Dedede...
I usually browse the r/smashbros sub a lot more often than I do this place, and that place is pretty awash with this leak in particular, so seeing no mention of it here was really surprising. I'm gonna try and summarise what the leak is and why most of us believe it over there.
This potentially...