Source: 5.4 PTR Now Live!!New Feature: Virtual Realms
Virtual Realms are sets of realms that are fused together, and will behave exactly as if they were one cohesive realm. Players on the same Virtual Realm will be able to join guilds, access a single Auction House, join arena teams and raids, as well run dungeons or group up to complete quests.
Players belonging to the same Virtual Realm will have a (#) symbol next to their name.
Testing on PTR doesn't guarantee the feature will be added on the live servers, but it's a very encouraging step in the right direction.
This could be big news for Redeemed, as it would give us a significantly larger pool from which to recruit new members.
EDIT: Thanks to Elader for telling me about this news yesterday.

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