Although there are lots of contributors to OpenJDK (which is where Java SE is built), Oracle continues to show up and do a large part of the work. This work is then used to build many distributions, including Oracle's JDK's. So the answer is yes these improvements will show up in most distributions.

But anybody who wants to use a JDK built by Oracle can choose between the Oracle OpenJDK build [1] with the GPLv2 w/ classpath exception license, and now have the option to use the OracleJDK free of charge in production with a one year overlap between LTS's [2].

[1] https://jdk.java.net/ [2] https://blogs.oracle.com/java/post/free-java-license