Okay, well here's my weigh in on the leak:
- First of all, I find it hard to definitively choose a side. It looks so so very real but lots of things seem off to me. The one thing I can say for certain is that the roster image, if real, is not complete. I do not for a moment think Sakurai would cut some of the characters not included, nor do I think he would arrange them as they are there. I must choose to believe the DLC rumor if I believe that roster because it just makes too much sense, and those 5 characters would fill those remaining slots perfectly for 55 total slots. It seems perfectly reasonable that Sakurai would want more time to develop those characters, but wants to get the 3DS version out as soon as possible. And it seems like that roster's layout could straighten up a bit if it's completed. The "clone corner" is weird and dumb. You don't see Luigi, Falco, and Toon Link down there. Just put the clones with their franchises like usual.
- Some of those model renders look straight up odd (Wario, Ganondorf), while others look amazing (Jiggs, DHD).
- If this is real, I will be quite pleased. Only two cuts (which I'll get to) and 17 newcomers, I would be ecstatic. The only real issues I have are no Mewtwo, and the presence of Doc. I will be less upset about Doc if he has some major differences from standard Mario, but otherwise I don't even think the effort to make the clone was worthwhile (sorry Doc fans). Dark Pit is a cool low-effort clone I would love just for the chance that he'll have other weapons from Uprising. I was completely sold on the idea of Duck Hunt Dog, but only after I saw the render (fake or real, that's a huge improvement on the original). I would also suspect that the leak from awhile ago was correct with Bowser Jr. being swappable with the Koopalings, which would be great. A little bummed that Chorus Kids would be coming late, but better late than never. Also Shulk is great. And Snake returning would be megaton material.
- Pokemon got the shaft

No Mewtwo, only two cuts we're Ivysaur and Squirtle, and the total number of Pokemon has gone down (Brawl = 6, Smash Wii U/3DS = 5). This is my only real gripe with the roster. Mewtwo returning seemed like a no brainer to me.
- I would be thoroughly suprised if the DLC characters are paid. I imagine they would be included by default in the Wii U version, and would be free for 3DS when the Wii U version hits.
Whatever, sign me up for #TeamReal. But I'm still very weary of it.