We are already working on the Flink 1.14. release and currently, following the usual release cycle, aiming for a release early September.
You can follow the process in the Apache Flink wiki .
Within the dev mailing list the discussion appeared if we would want to push the release cycle by a month. 
There have been some voices backing this request to be forced to upgrade less often but also some to keep it (or even make it shorter) to have a more focussed development cycle.
We would like to get a broader view on existing opinions.