It NEEDS to happen. Not even joking.
But only exclusively. Like if you had the katana in H3 then you would be able to equip it.
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Yes, we cannot forget the brave men and women who struggled and shed sweat, blood, and tears trying to complete the Halo 3 Achievement list. Their sacrifices for humanity should never be forgotten, and their courageous actions should be rewarded in every single Bungie game that they make from here to eternity. ...Yeah bullshit. Look, if they didn't do anything for Katana owners in Halo 3: ODST and Halo Reach, I'm not sure why you are expecting Destiny to be different.