WiiU console for the sole purpose of playing Smash Bros. I have all of the other Smash games. I will eventually get other games to play on the WiiU but, that is the main reason I will be shelling out the money to get one, when I get one.
PS4 console for the new Tomb Raider game when it comes out. Wife loves Tomb Raider games and I really like the reboot they did of the series last year, so I will be looking forward to it as well. For this reason, the PS4 will probably come before the WiiU... lol.
Otherwise, there are so many games that I want.. it would take forever to list... haha. Definitely Final Fantasy 15 when it comes out.