The Bracers also drop in Upper Blackrock Spire, quite common among the first few rooms of Orcs there before the first boss.

As of patch 4.0.3a they have removed D1 gear from the loot tables, and made it impossible to continue the D2 quest line.

RIP!

<b>Parts of the set well, at least, piece that <i>look</i> like part of the set are still available:</b><ul><li><div>https://vanillawowdb.com/?item=61958 Tattered Dreadmist Mask <small>[ This item can be purchased from a Guild Vendor upon earning the guild achievement Guild Level 20 and reaching Honored reputation with your guild. ]</small></div></li><li><div>https://vanillawowdb.com/?item=42985 Tattered Dreadmist Mantle <small>[ These can be purchased for 2175 Justice Points. ]</small></div></li><li><div>https://vanillawowdb.com/?item=48691 Tattered Dreadmist Robe <small>[ These can be purchased for 2175 Justice Points. ]</small></div></li><li><div>https://vanillawowdb.com/?item=62029 Tattered Dreadmist Leggings <small>[ These were added in Cataclysm, but their whereabouts are currently unknown. ] </small></div></li></ul><b>Information:</b> this may be what the GM mentioned in Shashos' post was referring to. But, as of right now, these are the only pieces currently in the game. The bracers, belt, gloves, and boots remain to be added. We'll just have to wait and see what Blizzard does for their next move in the arena of heirlooms.