There are a few significant incompatible changes introduced in 2.7's version of NBM packaging lifecycle. The result should be faster builds and more freedom in customizing the builds.
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>nbm-maven-plugin</artifactId>
<version>2.7</version>
<executions>
<execution>
<id>nbm</id>
<phase>package</phase>
<goals>
<goal>nbm</goal>
</goals>
</execution>
</executions>
</plugin>