The first expansion is Mists of Pandaria (Mistblade realm), which releases on January 7, 2022.
The second expansion is Wrath of the Lich King (Netherwing realm), which was released on Mar 25, 2023.
It's a realm where you can acquire a bit higher (x3) XP rates than usual to make the process less time-consuming.
Mistblade vol.2 is the latest season and is another chance for players to discover the wonders of Pandaria.