Patch 7.2 Ptr
As our friends at Wowhead noted, Patch 7.2 isn't just all about the Burning Legion with the introduction of the Broken Shore, new World Quests, and the Legionfall faction to work on.
One of the new features in Patch 7.2 is the Legion Assault, a retooled version of the pre-expansion Demon Invasions.
I've been on the PTR for patch 7.2 a bit this weekend, testing out things like the tweaks to the transmog system and the Demon Invasion systems.
Blizzard has started putting patch 7.2 on the PTR, testing out various features of the new patch like the Demon Assaults, the Pet Battle Dungeon, and best of all an update to tab targeting that will hopefully make it so when I hit tab I don't target something that's thirty yards away from me while six things are punching me in the face.
The patch notes for patch 7.1.5 were a bit last minute.
The folks at Wowhead have been datamining into the night and they've come out of said mines with a plethora of new models for mounts, including the BlizzCon 2016 surprise class mounts.
Surprise! Patch 7.1.5 just launched last week, but Blizzard is already prepping patch 7.2 for the PTR.