Dear Shogo, Not yet. Let us know what your top use cases are for using the restful APis (you mentioned user creations - as in - admin users or guest users?). If you want to use Cloudpath with Rucksu Cloud, Cloudpath allows APIs to create users today and they will work well with Ruckus Cloud.
You are right. When we say APIs not available, they are there (both streaming and RESTful) but we are working to build the infrastructure around it so that customers and partners can use them and we are able to scale to help them with all the tooling and support they need to use them.
All the cloud Web UI and mobile app use the same APIs - so, every element (config, read, report, notifications...) are API driven. It is a matter of when we release them to the public (after building a solid support infrastructure around it). Stay tuned.