It's not too surprising to hear that The Legend of Zelda on Wii U has been delayed. It would be harder to think of a major Nintendo game that wasn't delayed than one that was. Delaying games is what Nintendo does, and you have to respect them for that. There aren't many companies in any fields who would sacrifice immediate profit for a better product. So kudos to them on that. Hopefully this means they can take extra time to double up on Zelda Wii U's Wind Waker-ness, and iron out some of the Skyward Sword-ness.
Of course, Zelda's absence means Nintendo will need something big to release towards the end of the year, since they usually like to deliver something big as a "Christmas game" in any given year (except 2008, when they released Smash Bros. Brawl and Mario Kart Wii early in the year and decided that was it). Some gamers are of course yammering that Nintendo doesn't have anything else to release this year, because apparently to these people Splatoon and Mario Maker just don't exist.
Nintendo's 2015 lineup without Zelda certainly takes a hit, but the two aforementioned titles, as well as "smaller" games like Yoshi's Wooly World will still keep things interesting.
However, one thing I don't understand is that Zelda Wii U will be a no show at E3. Does this just mean it won't be on the show floor? That would be understandable, since the delay may mean it just won't be ready to be shown off in a playable capacity. But does Nintendo mean it won't have any presence at E3 at all? It seems a bit baffling that they couldn't cook up a trailer or something.
The big question though, is what game gets the November/December spot on Nintendo's calendar? Mario Maker still doesn't have a release date, so I suppose it's possible it could be held off for the end of the year. But with Splatoon and Wooly World coming in just a few short months, it seems weird that Nintendo would wait that long for another major Wii U release. It might be safe to assume Mario Maker gets a release sometime during the Summer, and perhaps Nintendo will do what they did in 2013 with Mario 3D World, and reveal a big game at E3 that will be released by the year's end. Hard telling what that could be. A 3D Mario seems unlikely at this current time (but again, 3D World just kind of showed up so who knows), perhaps it could be the new Star Fox that was promised last year, should Nintendo stick to their word and show the game off at E3 this year.
But if not Star Fox, what else could it be? A new Mario RPG (hopefully one that doesn't pull a Sticker Star)? Another new IP to compliment Splatoon? Perhaps the Project Big Robot demonstration can be turned into a complete, compelling game.
Whatever the case may be, it will be interesting to see how Nintendo fills that very noticeable hole they now have at the end of 2015.