In the message "JDK 11 Early Access build 8 available," Muneer Kolarkunnu announces that "JDK 11 EA build 8, under both the GPL and Oracle EA licenses, is now available at http://jdk.java.net/11." Kolarkunnu specifically highlights Build 8's changes to the Selector API that have been discussed on the nio-dev mailing list in threads such as Callback Based Selectors and More Selector Cleanup.
The JDK 11 EA Build 8 announcement also mentions that "VM option '-XX:+AggressiveOpts' is deprecated in JDK 11 and will be removed in a future release" as of Build 7. The announcement highlights JDK-8193033 ("Release Note: remove terminally deprecated sun.misc.Unsafe.defineClass") in Build 6 and reminds that "users should use the public replacement 'java.lang.invoke.MethodHandles.Lookup.defineClass' which was added in Java SE 9."
The "JDK 11 Early-Access Builds" page referenced in the announcement provides links to Release Notes, OpenJDK 11 Early Access Build Test Results, JDK 11 Javadoc API, and links for downloads of the OpenJDK 11 "early-access, open-source" OpenJDK 11 builds and the Oracle JDK Builds. An interesting note on that page states, "Oracle will no longer offer a stand-alone JRE for desktops. Starting with JDK 11 Oracle will only produce a JDK and a Server JRE."