Yoshida on Patch 3.2 Content - Famitsu Translation

[Alahra]

Twice, darklight gear as well.

Darklight was added to dungeons that also had new sets because it was the same item level as that dungeon. In addition to dropping the Darklight gear, Lost City/Brayflox HM/Halatali HM dropped the Protector's, Hussar's, Fistfighter's, Shikaree's, Magician's, and Pilgrim's sets, all of which were new at the time.

Since the new dungeon gear is most likely going to be i200, it will most likely drop new sets. It's rather unlikely that we'll see them alter the item level of the Yasha/Asuran gear to make it fit the dungeon—that's something they've done very rarely.

Instead, it'll likely be added to Centurio Seals (which mirrors what they did with Soldiery gear when it was made unavailable through Tomes) or perhaps made available in something like Fractal/Neverreap through tokens, to help fresh 60s gear up.

Well. I completely forgot about that, my bad. Okay its happened twice then I will stand corrected

It's still only happened once. While they added preexisting gear to the 2.1/2.2 dungeons, those dungeons also got new sets at the same time (they dropped two sets for each role). The only dungeons that didn't get new sets at all were the Snowcloak series in 2.4.