Like someone else pointed out, the release window went from ''winter 2014'' a few months ago to ''holiday 2014'' so they are more precise so I doubt it.
Also, Smash is WiiU's only big game for the holiday as far as I know. Hyrule Warrior is september, and Bayonetta is october so those will help WiiU build momentum but they still need a big game for black friday/christmas sale so I doubt they can afford to delay it.
They are two reasons that comes to mind explaining the delay. The balancing is taking more time than they thought, and I think I've read a interview where Sakurai mentioned this problem, and I assume since both games have the same roster with the same moves, when the balancing be done for 3DS it will also be done for WiiU so one huge part of the work will be done for the WiiU as soon as the 3DS version goes gold. The second reason is maybe they rethought about the idea of launching the 3DS game months before the WiiU's, like many ppl pointed out, maybe it was'nt the best strategy for many marketing reasons so they made the games only 1month apart.
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