i think they should bring it in for halo 4 cuz in halo 3 the game takes place in the year 2553 right? and you can read that the hayabusa was made a year before that. also halo reach takes place 3 years before that thats why it wasnt in reach. and if you have read the 2012 may edition of gameinformer it says halo 4 take splace 4 years after halo 3 so it should be in there