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Blizzard held a Q&A at BlizzCon following their big The War Within reveal, and a question was asked about cross-faction content. The devs didn’t actually mention any new cross-faction content aside from Delves, but they did reveal that guilds and mythic raids will both be cross-realm when the expansion releases.
Currently, mythic raid groups are restricted to characters on the same realm until the first 200 guilds have cleared them. It seems that limitation will be going away in the next expansion. Guilds are already cross-faction as of Dragonflight, so now you’ll be able to invite any character from your region.
This change will remove some of the last barriers to playing with characters on other realms, opening up a lot more freedom for players.