Looks like a good time to post this.
Let's be honest here: there was nothing to promote aside from New Island. Do you think he would just ignore any timed-potential reveals like this, for no reason, no matter how small? And most of March is already gone, yet still nothing?
Now, I'm not saying anyone should believe the following theory, just keep it in mind.
My theory is that there is going to be a Smash direct next month. Aside from the obvious, there's the fact that E3 is nearly three months from now, right? Or at least July, so it's already getting close. If he set up a Smash direct soon, that would cause even more hype for E3 otherwise. Let's also keep in mind that a similar situation happened around November. Aside from Marth, what did we get? Almost nothing. Next month? The first newcomer outside of E3. See where I'm getting at? Virtually nothing one month, next one, boom!
So, if this were to happen? Here's a few things that might happen.
1. Newcomer: I'm going with K. Rool, since I did find it weird that Diddy was revealed despite not being TF's JP date. And besides, all the Mario cast revealed like that? Peach especially since she was only shown off for an anniversary, which doesn't happen often? Seems fishy.
2. The Return of Snake: It certainly would cause hype.
3. Any Other Vet: Obvious possibility is obvious.
I doubt it, but... it's possible.