Blizzard has announced via a post on the website that they are beginning the process of connecting multiple low-population World of Warcraft realms with the higher population ones. This process will happen over the next few months.
The team at Blizzard are looking to connect those lower-population realms with the high population ones in order to boost the population for players.
Via the forum post by Blizzard:
World of Warcraft is best when you have a community of other players around you, and while numerous ways to participate in cross-realm play have been added to the game over the years, there are still many aspects of the experience that are realm-based. From your history with your guild to your interactions with the economy around you, a realm with a healthy population provides more opportunities, and it’s been several years since we last connected some realms.
Blizzard continues, stating that a comprehensive study has been completed and this process of connecting the low-pop realms with the higher ones will take place during scheduled maintenance over the next 2-3 months.
As this project unfolds, we will post notices in advance of each week’s connections in the appropriate regions and languages. During each maintenance period, everything will be automatically combined for the affected realms. When maintenance is complete, players on affected realms will log into Battle for Azeroth and find that they’re now part of a larger connected-realm community. At the same time, we’ll merge the appropriate realm discussion forums.
It remains to be seen which servers directly will be affected by this, but players should look out for the notices Blizzard will be posting for a heads up regarding potential changes to their Warcraft realms.