The two big ones I have some faith in are Lucas or Ness for Mother's 25th (because.....it's the 25th anniversary. It's kind of a big deal), and Ganondorf for Hyrule Warriors (it's the only big new game we have coming out.
Let's also not forget the decent possibility of a newcomer in an August Direct.
Let's see why the other Direct newcomers were revealed when they were:
- December 18th Direct:
Mario Galaxy Anniversary/3D World Release? (Both late November).
- February 14th Direct:
Punch-Out! (Arcade) 30th Anniversary
- April 8th Smash Bros. Direct:
Metroid Zero Mission 10th Anniversary,
??? (Maybe just because they revealed the other transformation character),
Yoshi's New Island,
Pokémon Battle Trozei
It's also worth mentioning that the Villager's reveal at E3 2013 was close to the NA release of New Leaf, and the Mii Fighter's reveal at E3 2014 was close to the NA and EU release of Tomodachi Life.
So what events do we have coming up in August?
- August 1st - Golden Sun Anniversary: Isaac
- August 24th - Hyrule Warriors (Japan): Impa/other Zelda newcomer
- August 26th - Metroid Anniversary: RIDLEY
Also, one last thing. Watch out for the tweets.
Before both the December and February Directs, Sakurai has tweeted a reminder telling everyone to tune into the Directs (both of which had newcomers).
Also, before the February Direct, Next Level Games (developer of Punch-Out Wii) tweeted a reminder too. This pointed to the announcement of Little Mac.
So we need to see who tweets before this Direct.
If Sakurai tweets, we're getting a newcomer.
If a third party company tweets, we can tell what newcomer we are getting (if IS tweets, we are getting Golden Sun, if Team Ninja or Tecmo Koei tweets, we are getting Impa/a Zelda newcomer, if Retro Studios tweets, we are getting Ridley).
So prepare yourself.
And be ready to predict in August.