It just makes me think of Brawl, it was delayed however many times, at least three, and it turns out that many big fans of the series dont think it lived up to the hype / lasted as long as melee in terms of playability. Just makes me think Nintendo is trying to add too many last minute things that the game probably doesn't need to feel great, things that may even end up dragging the game down a bit.
No, John, unfortunately we don't have a code for "There's a man in my closet with a gun to my daughter's head." Although we obviously should.
The delays may not be programming related. They may be putting more effort into design and such. Enemy placements, respawn rates, first spawn day, macguffin (ship part, treasure, whatever we're gathering) placement, stuff like that. From the videos, and the playable challenge mode levels they had for show, the gameplay seems to be fully functional, at the very least all the parts that would have any significant complexity programming-wise (that we know of, could be something crazy we don't know yet).