It seems like it's getting harder and harder for the big companies to surprise us anymore. Most of the Wii U specs (right down to the controller's touchscreen size) were revealed in rumours and whatnot.
While Nintendo had a very strong showing, Sony's was good too. Some of the Vita (weird name) demos were very impressive and I like how Sony was really pushing 'create your own content'-style in games, and the Sony cloud saves looked really impressive.
Microsoft's showing was rather muted, still waiting to be impressed by something on the show floor. The Halo 4 teaser was cool, a little disappointed that they went with a CG trailer instead of ingame footage (wonder if that means the game will possibly debut on MS's next system).
Oh, and I was really impressed by EA's conference. All of the games they showed were impressive in one way or another, and their president (or whoever he is) looks eerily like the G-man from Half Life.