In terms of the structured information information in DITA, there are samples of the well-known “garage” and “grocery” DITA sample code that come with the DITA-OT, along with versions that have been machine-translated from English into German and Spanish. The unstructured info includes a copy of the latest DITA 1.2 Language Reference and the DITA 1.2 Architectural Specification.
Other than the source code on offer that is used to run and compile the site, there’s not much that’s truly new here, but it is still interesting to see a working demo of an open-source CMS running some sample DITA code.