The only change in this version is the upgrade of the openengsb-maven-plugin (2.3.0). This change was pretty important to allow the extraction of sources in all projects using this pom.
You can download the release manually...
...or use it directly in Apache Maven...
<parent> <groupId>org.openengsb</groupId> <artifactId>openengsb-root</artifactId> <version>28</version> </parent>
The KEYS used to sign the release can be found here.
* OPENENGSB-2460 - Upgrade to openengsb-maven-plugin 2.3.0
* OPENENGSB-2442 - Release openengsb-root-28
Non by now.