But the 3ds version character layout doesn't look like that, does it?

Ya, it does, all the characters are mostly in the same spot. It looks a little different because they just squeezed 2 slots in there

Why have copy cats like Lucas when you could put in something new like Sora or Bayonetta (PG version)?

Duck Hunt got leaked the same way. I don't know what to think anymore.

I hope this is real because Lucas was my main back in Brawl, but I'm pretty sure it's fake ㅜ.ㅜ

The only question is other than for fans why would they put in Lucas since all of his specials pretty much ended up an unlockable special for Lucas? I wouldn't mind if the leak was real but I have my doubts...

It is mewtwo is fine that's how we've seen him and i think there not gonna change it's pose

The very video you linked to highlighted how this is most likely fake, so to call it a leak is a stretch.

They'll probably announce Lucas when they announce that Mother 3 will be released on the eShop...
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Since you can make Lucas through ness and wolf through fox with custom moves I say this is fake.