This will definitely be the biggest E3 2015 ever. Get hyped without reservation!

He just said that a mario game will lead the next system. 

Hell yea!!! 2015 us gonna be hugee in general

http://gamrconnect.vgchartz.com/thread.php?id=195608&page=1

Take a look at my thread if you want to update your Nintendo section.

Level 5 will also reveal a (at least) PS4 game.

Dude that is epic. I need to get in on this one.

Platinum games said they will show more info on Bayonetta at E3, and I am positive Platinum games is sticking Bayonetta exclusive to Nintendo.

You forgot about news on Shin Megami Tensei X Fire Emblem

Depending on western release date, Xenoblade Chronicles X (However,  I assume it will be the end of May or sometime in the summer)

Plus, more non-confirmed things include Animal Crossing Wii U and etc.

Huuuuuuuuuuuuge PSYCHED this year!!!!!

X will come out after May, that is certain.

Nintendo's E3 should be strong. Zelda, Star Fox, and Xenoblade are heavy hitters. Devil's Third has potential with a solid director and Nintendo's resources behind it. Iirc, EAD Tokyo is working on something, I think Galaxy 3 (Myamoto says the next evolution of Mario (like 64, Sunshine, and Galaxy were to their platforms) will come later, hence why I say Galaxy 3). Also Retro's project, probably a new Prime style Metroid as that is Nintendo's stated goal as far as 3D Metroid games. SMTxFE could impress, not sure. Those are the safer guesses and that's a solid foundation. And there will be more for 2016. Also betting info on N3DS western release second half 2015 with news on other titles and benefits it will get exclusively.