At Ignite 2018 today, Microsoft announced a new Cortana Skills Kit for Enterprise. The Ignite press release explains:
Microsoft is bringing customizable Cortana experiences and skills with the new Cortana Skills Kit for Enterprise. The end-to-end solution allows enterprises to build custom skills and agents, test them with users, and fully manage deployment to their organization. Developed with the Microsoft Bot Framework and Azure Cognitive Services Language Understanding service, the platform will help enterprises effectively use Cortana to improve workforce productivity. This is currently available by invite only and more broadly in the near future where companies and developers will be able to request an invitation.
The Cortana Skills is developed with the Microsoft Bot Framework and Azure Cognitive Services Language and should help boost Cortana's usage across workforces. Microsoft is also promising that the platform should help enterprises use Cortana to improve their workflows and productivity.
Currently, Cortana Skills for Enterprise is available on an invite-only basis and will become more widely available in the near future.