Until something is in active development, we cannot provide an estimate on when it will be available. As a live service, our schedule can change at any time due to the current needs. Guilds are a priority for us, and we do want to have them in the service as soon as possible, but we don't have a specific date for them just yet.
I'd highly encourage folks looking to have functionality added to the service vote on those ideas in our Feature Requests forums: https://community.playfab.com/idea/859/210168268-Guilds-Clans.html
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