The old joke that World of Warcraft can run on just about anything including your toaster is no longer true. Let’s just say that if your toaster is planning to install Battle for Azeroth later this year, it had best be one of those super-advanced internet toasters with wifi and bagel convection technology.
This is a long-winded way of saying that the system requirements for the upcoming expansion are a significant step up from Legion, so you might want to check your machine to make sure you’re good to run it when it arrives.
The biggest changes is the requirement of a 64-bit OS, 4GB minimum for RAM, 70GB of hard drive space, and a step or two up in graphics cards. Blizzard Watch makes the good suggestion of running Dxdiag on your system to make sure that you meet at least the minimum requirements for the future.