Celebrating this is premature.
There are only 6 sets datamined for the most part for each class. I think mage has an extra one probably as a Nightborne NPC set.
Warlock Tier 19
DK tier 18
notice how
each class has a "red" and "blue" set in there somewhere.
Unless LFR and Normal share a color or something, there isn't a set dedicated to LFR. There's Alliance/Horde PvP, Normal, Heroic, Mythic/Elite PvP.
More than likely these are just placeholder items for the LFR set with different visuals and set bonuses yet to come. HFC LFR had the same amount of gear and the same types of items dropped from each boss.
I wouldn't get my hopes up.