Guess that is the Valarjar-esque transmog set they said they would add in this patch. Looks decent from the icons.
Is there a place where we can find all the patch notes for 7.1?
If you look at the names there is a prefix, inv for inventory items and achievement for achievements.
Look at the second icon for an example, an achievement.
And then the teeth, chests or those I mentioned.
Plus there are two genders by name for nightborne and nightfallen, and just the generic one for withered.
If they were achievements I would expect them to be named characters, again as with other examples.
Edit:
Just checked wowhead.
One used for an achievement, the nightborne female.
One used for a spell, the nightfallen male.
Others are unused.
Usually that prefix indicates its intended use, though it seems an icon is reused elsewhere to save creating a new one where it isn't necessary.
Is blizzard hinting at a new Diablo game or perhaps a remake of Diablo 2?
The 2 last on the first line and the 6 first on the second are exactly the same as in Diablo 2.
Diablo, small charm, large charm, grand charm, cube, scroll of town portal, stone of Jordan, Tome of town portal.