Ok, so I'll preface this by saying that I'm really interested in the melee demon hunter, and looking forward to what I anticipate will be a much more engaged play style than what we've seen heretofore (i.e. Marauder's Hide&Fire, UE Stand back and blast).
My one major concern at this point is that a DH can't dual wield, and the only off-hand we're allowed is a shield, for which we have no use. I'm of the opinion that in 2.4 a change be made so that DH can retain a quiver (i.e. Spines/Emimei's Duffel) regardless of what we have equipped as a weapon, or even better, we be allowed to DW 1-hand swords/daggers.
I haven't seen any mention by the Devs regarding a change to the basic DH mechanic, so I presume that we will be left with a "sword & board" but I think this is counter to the "assassin" style concept that Blizzard is going for with this Set.
Mod Edit: i moved you post since this discussion is happening here and doesn't need a new thread. Also the answer about what a melee DH will be able to equip is 2 posts above