Ok, I now build the portal dependencies from trunk (the portal src beta4 download is missing some build files)
and using the maven plugin from github mvn:liferay goals and archetypes work for me!
It seems http://issues.liferay.com/browse/LPS-19353 is still an issue.
Add his repository to the plugin pom, if it's not present.
1
2 <repository>
3 <id>springsource-external</id>
4 <name>SpringSource Enterprise Bundle</name>
5 <url>http://repository.springsource.com/maven/bundles/external</url>
6 <releases>
7 <enabled>true</enabled>
8 </releases>
9 <snapshots>
10 <enabled>false</enabled>
11 </snapshots>
12 </repository>