I'm pretty sure most can agree that K.Rool is almost a guaranteed after seeing Kremlings in the game. Bringing them back without K.Rool would be one of the strangest business decisions I've ever seen.
Edit: No offense, but even though Dixie Kong's deserving, putting her in after what we've seen is just blatantly dumb. Odds may have been in Dixie's favor before...but I think it's pretty clear the tables have indeed turned in that sense, K.Rool is definitely the one with better odds now. Again, no offense to Dixie Kong fans, but you can't really deny what's been given to us.
I'd be much more cautious if I were you.
Let's say that the Gematsu leak is true along with of course Mewtwo's return and a retro newcomer (and I expect all of this to happen). That gives us fourteen newcomers, which is a lot. If we do get fourteen, what does that say for characters outside of this ring? That they're not as likely as we want to think.
First off, there's no guarantee that we are going to see anymore than that. That's already Melee size and it's pretty obvious we won't get as much as Brawl. This happens and characters like K. Rool, Dixie, Krystal, Isaac, etc. are all out. Even if we do more newcomers, spots are very hotly contested and pretty much anyone not disconfirmed is game.
If K. Rool isn't out at this point, then he's not only competing with Dixie Kong, he's competing with everyone not named Chrom/Palutena/Shulk/Chorus Guy/Mii/Pac-Man/Mewtwo/retro newcomer over one or two spots. All fans can do now is cross their fingers and hope that not only we get more than fourteen newcomers, but that their character of choice will claim the last spot or two that is made.
I hope that K. Rool gets in, I really do. I believe he is among the more likely potential additions and will fight for him until the end. But at the same time, we are running out of space and he is going to have a very hard time getting in. We'll be very lucky if he actually shows up in this game.