Not reading the comments but one I've noticed is my Demo Warlock's glyphed Wrathguard is once again dual-wielding now.
The 750 medal mount reward Priestess' Moonsaber and Bloodthirsty Dreadwing initially weren't available cross-faction if you unlocked one of them, unlike the krolusks from the 200 medal reward. As of 8.1.5 unlocking one allows you to use the corresponding mount on the other faction.
Looks like they lied re: leaving the portals alone in Ashran. All portals bar the Org/SW ones are gone now.
The trash you have to do in Dragon Soul before the 4th boss Hagara the Stormbinder has been fixed. You once again have to click the orb to activate the small portal trash event. Before that, the trash coming out of the portals already was spawned there and you just needed to kill a few groups to engage the boss, while the normal portal spawn wasn't necessary anymore. This was bugged since 8.0.1 if i remember it right.
What happened to the weekly Island Expeditions world quest you have on alts?
Shame player mage portals don't have that same new effect.