Completely agree with Rawkstar. Here is my own, quite lengthy, personal analysis of the situation though :-)
If I don't remember incorrectly, the ballot ends October or November. After that Sakurai and the sm4sh team will probably discuss and valuate which of the most voted for characters shall get in. After that we're definitely at the end of 2015, so the actual making of the ballot voted characters would first begin 2016.
Before the ballot ends though, I could very well see Wolf comming out in Q3, and maybe, just maybe, another character in Q4. My gut feeling though is that all we will see this year will be Mewtwo, Lucas and Wolf. Which I am completely fine with. Keep in mind though, none of these should have been affected/caused by the ballot votes, as they already where in the making/planned for before the ballot opened.
In 2016 I think there will come 2-3 characters, the latter if theres "only" 3 characters getting in this year. Who it will be I have no clue on at this point, though I do have some predictions myself. Here they are in no particular order:
- King K. Rool (whom my ballot vote went to) or Dixie Kong. The DK franchise just needs a 3rd representative, and after seeing the already huuuge demand for K. Rool (and some other factors), I am pretty convinced he will get in.
- Isaac. Now I must confess, I don't really know who this dude is, as I never have played the Golden Sun series before. He does though have what seems like a huge fanbase, and a huge demand in the ballots. So wouldn't be surprised to see him getting in.
- The Inklings (or one of them). To promote the Splatoon game (and franchise), though it will be a bit late to do it considering their game comes out soon. But, if the game sells well, I could see Nintendo wanting the Inklings in to promote the franchise as a whole, so many people recognize the franchise in upcomming instalments. That, and there is also a rather big support for them on the ballot votes.
I dont think Ridley will come in since he already is a stage hazard, and Sakurai seems very adamant on putting him in the game.
Roy also has huuge support on the ballots as of thus far, but I just don't see a 5th FE representative, especially when franchises like Zelda, DK, Starfox etc. are relatively under-represented.
Snake has a ton of votes as well, but I'm just not sure any third party characters will get in, no matter the amount of support. And I also have a gut feeling that his apperance in Brawl was his last in Smash.
I don't think Waluigi will get in either, since he's an assist trophy. Not that he is likely to get in anyways, but I see a lot of people who vote for him.
That is my complete analysis/predictions. Sorry it was pretty damn long, but I just love wondering about all of this character speculations :D