I'm definitely hoping Yoshi next week, but you never know what Sakurai is up to, so we'll see! If we get Yoshi, I don't see us getting Wario. Even if they do represent different series, they're still technically both from the Mario-franchise. And I don't know, I'd rather Wario be left for the release of Mario Kart 8, or something else.
That said, I do think we get something alongside Yoshi this month. First I was thinking a Pokémon character because of Pokémon Battle Trozei, but its Japanese release date coincides with US Yoshi's New Island, so not sure about that. It's also an eShop title, but I guess there's a first for everything... and I guess the US release could be acknowledged instead. Then there's the new Metal Gear game coming up, and while many think promoting a competitors game is out of the question, I don't see why Snake couldn't be revealed. But he'd require a Direct/video like Sonic, so again, not sure... My third option would be just some random reveal who doesn't have anything coming up, preferably Ice Climbers, Ness or Captain Falcon.
So basically what I'm expecting this month is Yoshi and Pokémon/Snake/Random.