How awesome would it be if you could have a sword on your back going into battle against the cabal and fallen. I personally think it would be a great incentive to try and beat the vault of glass if you get an awesome bad ass sword!!
If there are swords they have been kept under VERY tight wraps, with only one mention that I could find, in the weekly update, saying one was claimed from an ancient grotto.
EDIT: That said, I want a sword. Gotta be good though. Maybe multiple types of swords, some with faster swing speeds, lower damage, big slow swords etc.