We have been getting so many leaks over time for Smash 4; this one, for example, apparently by the Tower of Smash leaker explaining the news from the direct. I'm honestly sick of these leaks, and I plan to buy the Wii U version ON THE RELEASE DATE to see what lays within it; if I find what the leaks say, then I will have proved a leak for the first time; if I don't, then I will have DISproved a leak for the first time, though honestly I think most of the leaks will be disproved by then.
Also, does Smash Run have any bosses? I don't have the 3DS version yet, so I can't find out myself.