I mean, I expect a Direct or two to happen in the near future. Smash 4 had two Directs in 2014 before release, not counting E3 2013 or 2014, along with about 5 other reveals in general Directs in both those years. There's a lot of info to reveal, and not a whole lot of time to reveal it. July was too soon, but August/September is when we should expect to see something at the earliest. This week might be a little too early, though.
Any notable Donkey Kong anniversaries between now and December? A lot of blog posts on the Smash website seem to be tying in to anniversaries of various characters and series. If K Rool is going to be revealed in a Direct, they might try to broadcast it then. Or maybe that'd be too obvious.