I'm expecting all 3 to bring it this year.
Sony will want to keep momentum going in order to secure the win in the U.S. They should have many 1st and 3rd party games shown. The PS4 line-up is more secretive than Microsofts and they will show what they've been hiding.
Microsoft will want to pull ahead in the U.S and will likely showcase Halo, Gears, and a few exclusives that they've paid for. A price cut or new model could be announced as well.
Nintendo has stated that MK8 won't be just a one and done boost for the Wii U. They will want to prove this and put themselves back on the map. I don't really know what to expect with them but I'm pretty sure we'll see Zelda, NFC games, and the reveal of "Quality Of Life". I'd also bet on Bayonetta 2, or Hyrule Warriors being Summer releases along with Wii Sports Club Baseball.
Should be interesting for all 3.







