I have read it from this
https://www.reddit.com/r/java/comments/86ce66/java_long_term_support/
From what I have read, you can still use OracleJDK for development. However for production you must pay.
There are changes coming to OpenJDK, patches are only done in latest release and won't be backported to older version. There are some initiatives like AdoptOpenJDK which will do this. Also IBM and Red Hat
may do the backporting for OpenJDK