I updated the plugin a bit and released an RC1 version ; see the web site for more details. The major change is that the plugin does not rely on the announcement plugin anymore. Instead, I have implemented a very basic parser of the changes.xml file. This allows to have some kind of interface to render the actual blog entry

public interface BlogEntryRenderer {
String generateContent(final Project project, final Release release);
}

I have created two implementations of this interface, one which simply outputs all the issues in a table, the other separates issue per issue type.

The first one, the classical renderer gives the following output for instance:
classical renderer

The hierarchical renderer gives the following output for instance:
hierarcical renderer

You can download the plugin by issuing the following command:

maven plugin:download
-Dmaven.repo.remote=http://stephane.nicoll.net/maven1
-DgroupId=nicoll
-DartifactId=maven-confluence-plugin
-Dversion=1.0-RC1