well if you pay attention to one of the destiny videos, you can clearly see a machete on the back of a Titan.
this dose confirm the use of melee weapons but not how they will be implemented tho.
also in one of "moreconsole"'s video, it was leaked from an bungie employer of him rushing thru the hell mouth with a a sword and almost got skinned by their boss for leaking it.
while you are reading, please help by supporting my idea and making it possible:
http://www.bungie.net/en/Forum/Post/68693909/0/0/1
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oh well thank you, no i did not notice that, kinda just letting it all be a surprise to me. Thank you for letting me know that is awesome. and i will be glad to support your idea.