I'm still surprised Nintendo has not put an Animal Crossing game on Wii U yet, the last 3DS game was a huge hit, especially in Japan. I could see it boosting sales, but then again they might be saving the next Animal Crossing for their next handheld.

That is somewhat the important part.

animal crossing for the holidays

I know it sells a lot more on handhelds, but Nintendo has tried to rely on first party games such as Super Smash Bros and Mario Kart 8 to bring up Wii U sales, but the sales just drop after a certain amount of time anyway. My point is that i'm surprised they haven't tried to boost it with Animal Crossing yet, I know it might not be as big as other first party games to some people but I feel like it would boost console sales by a pretty decent/average number. Or it could be huge.

They'll probably just save the next Animal Crossing for their next handheld though. 

I don't understand what's so awful about XCX, Star Fox, and Mario Maker being their Holiday lineup? You have a huge RPG, the long awaited return of one of their beloved IPs, and a new Mario for the more casual crowd as well. They should be fine with that trio.

If anything else big were to come out this year for Wii U that's unannounced, I would say maybe Animal Crossing since I suspect that's already been in development for awhile. If that were added to the 3 I mentioned, then they'd have their strongest holiday lineup for Wii U to date. Zelda not needed.

If it's ready: Metroid.

People are saying nothing because they're a bit disillusioned with Nintendo.  I know I am at this point.  Every E3 people have wild predictions and most years are just a big disappointment.  So I'm gonna say it, no Metroid this year, no new 3D Mario game, etc.  They will announce stuff we already know about, maybe a couple games we didn't know about but won't care about, and that's that.  I'm gonna guess that they'll show a bunch of Devil's Third and Yoshi's Wooly World etc.

Isn't there some revolutionary Project Giant Robot by Miyamoto?

There will be a ton of surprises at E3 but no game can replace Zelda.

but metroids annversay is first next year, would make no sense having it release this year