Let's me see...
Sm4sh is always cool, you'll be occupied. It's a great game filled with a competitive atmosphere. There's a lot of games I recommend you getting, you won't be dissapointed with your purchase if you're into things like Zelda.
Xenoblade Chronincles X will be released on December 4th and it looks really nice.
Starfox.
Zelda U.
THen there's the Shinigami Tensei X Fire Emblem which is going to be released next year.
To say the least, there are many awesome games that will be making appearances. It really just depends on your interests. Since I don't know what you're into, I can't really suggest a "one size fits all" kinda game. Just know that there's a lot that you may not have heard or may not be interested in. There's Hyrule Warriors, Super Mario Maker, Bayonetta 2, Zelda: WInd Waker HD, Kirby, Yoshi, Pikmin and Donkey Kong. Especially the array of Mario games that's out there.
Personally, I mainly picked up my Wii U for a couple of games, but I'm not disappointed, because I play those games so much that I feel like even if I did have other games, I wouldn't play them because of how much time I spend playing Sm4sh and Mario Kart 8. Like seriously, I haven't even gotten past my third levels of Hyrule Warriors because I'm constantly racing and smashing. It really just depend if you think that it's worth it.