This rumor shouldn't be taken seriously and this is why. When Titanfall was announced for Xbox, it was announced as a Xbox exclusive. Last time we checked exclusive meant that it could be found at only one location. Additionally, EA has already said that Titanfall would not be released on PS4 so what would compel EA, who has already snubbed the Wii U, to release the Xbox exclusive on the Wii U and not also the PS4?
CouchJockeyz claims via their sources that 'Nintendo has paid a substantially large fee to EA to sway the mech-shooter over to the struggling platform but Nintendo believes that they would not only be able to satisfy the Nintendo faithful, but also draw some sales to the Wii U with a cheaper buy in cost than the Xbox One.' We could definitely see Nintendo throwing in some funds to persuade a developer to release a game on the Wii U, which has seen some struggling sales, but it is unlikely that EA would release the exclusive title on any other system besides Microsoft's consoles.
Apparently the deal between Nintendo and EA is 'very hush-hush' and that 'only a handful of developers and executives in the know of this deal' but with Titanfall being slapped with the exclusive to Xbox label we doubt that this rumor is even remotely credible. While we are sure that many Nintendo gamers would be very pleased with a release of Titanfall on Wii U, this rumor is sure to be false due to its exclusivity to the Xbox. That's quite a shame because Titanfall looks really impressive and a lot of gamers have taken a liking to it.