https://www.youtube.com/watch?v=pFNhYHPAhhg
This video, which frankly just shows a still image, no cursor, no icons selected, top-screen only "update" to the 3DS roster with the clones relocated to their proper spots and the addition of dlc characters.
1) Mewtwo, not supposed to be ready until Spring.
2) Wolf, whose icon is at a strange focus and scale compared to the other icons.
3) Isaac from Golden Sun who is barely seen as an icon and was not seen as an Assist trophy in the 3DS version nor were there any Golden Sun trophies.
4) Bandana Dee whose icon a) looks particularly flat, unlike the other renders in the "leak" and b) looks exactly like an edit of his Return to Dreamland artwork but with "American Kirby" style angry eyebrows put in... as I stated earlier this page.
This is from the position of the VERY cynical.
Edit: The uploader said he'd post something new as an update to this minimal and very fake-looking evidence. But considering how the Tower of Smash leaker "updated" to prove himself after the 50 fact extravaganza, it is false until proven real.