There are various companies that are taking measures or issuing important statements due to the Coronavirus emergency. In this sense Blizzard tries to encourage people to stay at home through a special bonus dedicated to World of Warcraft. It will allow players to receive double the experience than is usually expected. As you can read from the official website, in fact:
If you are within the walls of your home and find yourself back in Azeroth or are leveling up with a new character (or two), you will get a special bonus that will help you on your journey. Until April 20, 2020, all characters in Battle for Azeroth, Legion and Introductory Edition will gain a benefit called “Winds of Wisdom”, which will provide a 100% increase in experience earned!
As you can see, the promotion will last until April 20th. It is therefore a good opportunity not to be missed for all fans of the famous MMO.