Patch 10.0.7 arriving 22nd March

A new patch arrives very soon, bringing with it a lot of class changes, a few interface changes and a whole new area to explore.  In short:

*  Lots and lots of class changes .. too many to list!  See Blizzard's page for the full info.
*  New area with new quests, treasures, battle pets and a new faction.
*  New "treasure room".

For the full run-down, check out Blizzard's post. 

Wowhead has also written a guide, which is perhaps a little more helpful: https://www.wowhead.com/guide/dragonflight-patch-10-0-7-overview