Burp is getting a brand new REST API, which can be used by other tools to integrate with Burp Suite:
In the initial release, the REST API supports launching vulnerability scans and obtaining the results. Over time, additional functions will be added to the REST API.
The API is self-documenting and when the service is running you can view the documentation by browsing to the API URL (with a configured API key):
You can also download an OpenAPI specification in JSON format.