Blizzard is rolling out World of Warcraft: Shadowlands' pre-patch on its playable test region. You don't need beta access for this one, so you can hop into Blizzard's game client and start your .
The content currently being tested in this WoW: Shadowlands pre-patch update are core class updates, in-game navigation improvements, the new player experience, and character creation and customisation. There's also a limited-time Scourge Invasion you can try out. Wowhead has data-mined the event and has found Epic tier loot from special Undead rares in Icecrown. Apparently, there are bosses from Icecrown Citadel, Naxxramas, and Northrend dungeons, too.
There's not long to wait for more content, either. In a post on WoW's corruption system would get cut in a Shadowlands pre-patch, so we might see something to do with that.
There are some other things that players have been discovering from the Shadowlands beta that could pop up here, such as WoW PvP world quests.
Some things, however, you'll probably have to wait for. One of the update's new areas includes a WoW content creator Reckful.
If you're looking to keep yourself busy while you wait for the WoW addons you can try to spice up your gameplay.