Today we have two releases. As 1.8.0.Final was released before WildFly 10 Final was available, we decided to release 1.8.1.Final which is now built on top of WildFly 10 Final.
The bigger release today is 1.9.0.CR1, this release contains a large number of bug fixes and improvements, but no major new features.
For the full list of issues resolved check out JIRA and to download the release go to the Keycloak homepage.