See the WebCenter Content OTN Page for the download links.
http://www.oracle.com/technetwork/middleware/webcenter/content/downloads/index.html
11.1.1.9.0 still uses WebLogic 10.3.6.
If you are doing a new install you will need to download the 11.1.1.9.0 version of RCU which is available under the Required Additional Software section.
If you are upgrading an existing installation from an earlier release to 11.1.1.9.0 you will need to run the Patch Set Assistant to upgrade the schema. See Upgrading Your Schemas with Patch Set Assistant in the Oracle Fusion Middleware Patching Guide for details. Make sure to backup your schema before running the Patch Set Assistant.
Oracle Support is recommending that existing customers wait for the first bundle patch before upgrading to 11.1.1.9.0. That is because there are a lot of bugs addressed in the latest 11.1.1.8.0 bundle patch that did not make it into the 11.1.1.9.0 release. EXISTING customers are likely to run into regression issues that were already fixed if they had the latest 11.1.1.8.0 bundle patch installed.
If you are starting a new project I would recommend installing 11.1.1.9.0 and working around any bugs you find. The first bundle patch for 11.1.1.9.0 should be released before you need to go into production.
One of the major features in this release is the addition of Digital Asset Management (DAM) to the Content UI.
The link to the documentation is http://docs.oracle.com/middleware/11119/wcc/index.html. Someone was reporting that the link on OTN was wrong.