Monster Hunter Generations for the 3DS came out in Japan back in November 28, 2015. Now, the game is coming to America and Europe on July 15th. After that, there will be a free DLC that will allow cat-like playable characters, the Palico, to dress as Fox McCloud and have other Star Fox-related cameos. I had intended to mention the Japanese announcement for the Fox McCloud DLC a while back, but I was delayed. Sorry about that, Fox fans.
There is more to the DLC than just a Fox McCloud costume, at least in the Japanese version. That version included the Fox McCloud suit, a blaster, a Landmaster skill, and other things. There were also Zelda and Metroid collaborations for the game. Check out the specific features for the Japanese version at gematsu.com. I suspect the English version of the game will feature the same sorts of DLC options eventually. Originally, this DLC was released as part of a 7 Eleven promotion in Japan, but in America and Europe, it will be released for free, though the release date is not yet public.
Thanks to Hope(N Forever) for the heads up!