The staging repository is available here:
https://repository.apache.org/content/repositories/orgapachetomcat-142/

The documentation site is available here:
http://tomcat.apache.org/maven-plugin-2.0-beta-1/

Changelog:
http://tomcat.apache.org/maven-plugin-2.0-beta-1/jira-report.html

Guide to test a staged release maven plugin:
http://maven.apache.org/guides/development/guide-testing-releases.html