For the moment we got no proof if either N or the devs know about it , all of this is speculation but for more "safety" i suggest to not tweet them about it.Big N knows about it and the devs very likely as well. They probably just enjoy the push. Devs aren't evil and the actual indie devs that wrote ironfall might even want to allow homebrew as long as possible. Maybe N asked them if they want to pull the game and they said no. I mean, you can find the hack at the second page of google if you search "ironfall invasion 3ds".
--------------------- MERGED ---------------------------
That would have been fun to watchPlus, if nintendo pulled any game smea said, that would make them smea's bitch xD!