Or how about when Deej mentioned in a weekly update that one of the Devs held of a Hive horde with "an ancient sword he found in a long forgotten gorge while his fireteam ran away screaming" then in the following weekly update he said he got in trouble for talking about it?
Well if that is true mostly didn't want him to talk about cause they were not sure they were keeping it in game. Which is why we haven't heard of it since.
As I talked about with somebody else, the big thing about Destiny with characters is balance and choices. Their melee abilities are a big part of those balance and choices. If they include melee weapons they have to be able to keep that balance. As long as they find a way to do it I am sure they will add it.