I wouldn't be surprised, however, is some of the rumor is true, mainly because there are so many predictions. The quantity means at least some stuff will be right I mean, I could just as easily make a bunch of predictions (many of these are the same as what he said):
-There will be a new generation of Pokemon games on the 3DS revealed sometime in the 2013, but the actual game won't be out until late 2014 in Japan and perhaps not until 2015 in the west. It'll be in 3D and the graphic style will be similar to the Colosseum games. To bridge the gap, there will be a "Pokemon Grey" for the DS (to put a final knot on Unova) in 2013/2014 and maybe a bare-bones "Pokemon Stadium/Colosseum" style game for the 3DS that will introduce the graphic engine but wouldn't have a story mode or anything.
-A new Mario game will be revealed by the end of E3.
-A new Yoshi game will be revealed in the coming months.
-There will be SSB4 trailer at E3, but it'll be almost entirely pre-rendered and have little to no in-game footage.
-There will be old episodes of the Super Mario, Pokemon, Donkey Kong and Kirby on TVii within the next year. Captain N, the few episodes of F-Zero that were dubbed into English, and the old "EXCUSE ME, PRINCESS" Zelda cartoons won't be.
-Retro is working on a Metroid game.
-The Mother Series still won't be brought to western shores, because the video game gods hate me.
-A 3DS remake of Majora's Mask will be made.
-Mario Kart U will be out by the end of 2013. Mid-2014 at the latest.
-There will be a second Nintendo Land.
-Reggie will create a meme next E3.
I'll probably have just as good a rate as the rumor.