Blizzard has announced Cross-Faction Guilds are coming in Patch 10.1: Embers of Neltharion. While Cross-Faction grouping enabled players to be the faction they wanted and still play with their friends, many had to create alternate faction guilds fracturing their guild communities since guilds are single-faction.
Blizzard looks to be rectifying this situation by enabling Cross-Faction Guilds allowing players of both factions in a single guild. Currently, details are sparse regarding the limitations of this new system, but expect thorough testing on the PTR.
Dragonflight Patch 10.1 RevealPatch 10.0.7 on March 21st Patch 10.1: Embers of Neltharion Patch ContentCross Faction Guilds in 10.1 Patch 10.1 Group Interview Season 2Season 2 Mythic+ Rotation Affix Refresh — No Seasonal Affix . Read more on wowhead.com