I think E3 will impact the Xbox One's sales a lot as Microsoft finally got thier messaging straight (nailed it), and showed off enough promising looking games (great diversity) to ensure people watching that there will be no shortage of games on X1.
I know some people complained about the strong 3rd party preasence at thier conference, but I think that it was a good thing as they really could use good 3rd party support right now with PS4 being viewed as the Multiplatform machiene.
Sony's conference was good, and I'm sure the Destiny bundle will do very well, but I honestly don't like the look of the white PS4, I would much rather the launch jet black color. Also, I think they did a phenominal job for the first 30-40 mineuts with game after game shown with some surprises too, but they absolutely killed the momentum with the middle part.
Nintendo also did a fantastic job with thier conference, but I am a bit dissapointed that so much was 2015. Still, I think this holiday would be a great time to jump into the Wii U family. Also, Zelda looked amazing!