Depending on your timezone, World of Warcraft's Patch 8.1.5 is either currently available for you or will be coming at some point tomorrow. The update brings with it the long-awaited appearance of Kul Tiran Humans and Zandalari Trolls, a variety of new World Quests and profession-specific items, the return of the Brawler's Guild and Wrath of the Lich King's Wintergrasp battleground, and the list goes on for a while.

If you're interested in a quick overview of what all of this looks like in-game, as well as what the theme of the whole update even is, allow me to share with you the recently posted preview. Have a gander, it's a pretty short video considering how much stuff it covers:

Naturally, a patch of this size is also bringing with it a rather large assortment of balance changes. There is pretty much no way for me to cover them in brief, so if you're interested in all of the details, you should hop on over to the full patch notes. 

And finally, if you would like to learn a little bit more about each of the features coming in with Patch 8.1.5, you'll find what you seek over at the official website. Have fun leveling!