For what reason? I know some people have always expected it to be delayed to 2015, but nothing happened recently that fueled fresh rumors of a delay.
Sakurai has a big problem, he usually takes more than he can chew, the end result is excellent of course but that doesn't mean he doesn't still have a problem.
It happened with kirby's air ride (3 times), it happened with meteos, it happened with brawl... twice, and it happened with kid icarus. We are not talking of a small delay here and there, we are talking of half year and repeat delays. Since melee all his games have been delayed. So no, is not only brawl, how another poster has written.
It's then not surprising that making two games (yes two, because i've seen people in this thread give excuses of not being that hard to do or is still the same amount of work, when other people question why the handheld version exists). And no, Sakurai saying he really wanted to do the portable version is not a good excuse, he knew where he was getting at, he knew it was too much for him, he even got the tekken team to help him, and not only that but he has an injury in his arm, yet he decided to continue with it. Other teams would have decided to scrap one of the versions, but Sakurai, for good AND bad, have decided to continue this route that if not delayed can harm both versions.
So that's why im not surprised in the slightlest if the game gets delayed tonight, I really hope that's not the case in the end or hopefully only the portable version is delayed (the wiiU needs more than ever the game) i really really hope... But I will not be surprised tonight if the delay news happens.
Working on games shows you that making them is a HUGE task, and it was, since first glance when he showed he was doing two versions, that the task he was going to take was a gargantuan one.
Dont get me wrong, I love Sakurai's games, and I love all the attention of detail he gives to them, because at the end of the day, they come out perfectly, but that doesn't mean he isn't lucky that he is working on nintendo. And im pretty sure he also knows this.