I'm excited about Office Graph and the APIs being developed...is there an official release date for their use?
Thank you for your question. Looks like this was answered some time ago, so we’re going to close this request. Please let us know if you have any more feedback about the Microsoft Graph.
Office Extensibility Team
Office Graph APIs for /tendingAround and /workingWith are now in preview as part of the Office 365 unified API, which exposes a single endpoint for users, groups, files, messages, events and other relationships as those from the Office Graph.
The preview is available under https://graph.microsoft.com/beta. We are working on general availability and will update once dates are final.
For more information on the preview apis you can go here: http://dev.office.com/unifiedapis