When they updated CI 3.x ?

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Hello support team, I'm worried about only seeing updates of the CI 4.x version and I wonder:
- Why the CI 3.x version does not have updates?
- Will you stop supporting it or giving it support?
- When we wait for a new update?
- What is the time lapse between version and version?

by last:
- If you intend to do disappears CI 3.x will you give the community a tool to migrate from 3.x to 4.x? or will it be something personal and manual?

Important: what maturity do we expect from the CI 4.x version to involve it in our projects? and meanwhile we have done with CI 3.x
thanks for answering
*non-English redacted*

I think that the update 3 version will be in the event that security vulnerabilities or critical errors in the framework will be detected. 

Migrate from 3.x to 4.x is not backwards compatible, it is easier to write the application again.

The release date of RC 4 version is not officially announced. I think it will happen in 3-4 months (in my opinion).