Krystal is not yet confirmed, nor is it a leak. There are some good
pointer of her inclusion indeed, aside from one of the few potential real leakers
on the smashboards, but there is nothings sure yet. Same goes for Luigi
The knuckles and Tails thingy was indeed to be expected, but there will be a lot
of fanboys left disappointed.
Also, I've been thinking. These screens and stickers are only available for characters
that can actually play in the Subspace Emissionary. Perhaps there are some characters
that can not be used and are only available as bosses.
There is also a small hope for the possibility that not all characters were unlocked when
the movie was made. It's a ridiculous idea in and of itself, but I still hope Mewtwo returns,
so bear with me.
Krystal: Yeah, not confirmed 100%, but good evidence for her inclusion. In the how to play vid on the Japanese Wii page, when they're showing the stickers, they show a huge
Krystal sticker. If you recall, large stickers are very powerful and character specific. Then there's also the one girl who listed
Krystal as one of the voices she did for Brawl in her resume (along with Samus and ZSS).
Luigi: Not much here, but there was that interview with the one guy that's working on Brawl who accidentally said
Luigi's name. The interview was from E for All.
I'm almost 100% sure that every character will be playable in SSE. It'd make no sense on Nintendo's part to make such a great single player game but to exclude some peoples' favorite characters. I'm fairly sure that the bad guys in SSE (such as Bowser, King DeDeDe) are being mind controlled and that you can play as them once you beat them in SSE.
And if you think about it, that game must have had everyone unlocked. They would have made sure to show those screens before unlocking
Ness, Lucario, and Jigglypuff if that wasn't the case. To me it seems like a slip up and that they forgot about the stickers. Don't get me wrong. I'd love for
Mewtwo to make a comeback, but it doesn't seem likely at this point.
Hopefully I'm wrong.