$ mvn archetype:generate
... 
Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains): 314: gwt-maven-plugin
Choose archetype:
1: remote -> org.codehaus.mojo:gwt-maven-plugin (Maven plugin for the Google Web Toolkit.)
Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains): : 1       
Choose org.codehaus.mojo:gwt-maven-plugin version: 
1: 1.1
2: 1.2
3: 2.1.0
4: 2.1.0-1
5: 2.4.0
6: 2.5.0-rc1
7: 2.5.0-rc2
8: 2.5.0
9: 2.5.1-rc1
10: 2.5.1
Choose a number: 10: 10
Downloading: http://repo1.maven.org/maven2/org/codehaus/mojo/gwt-maven-plugin/2.5.1/gwt-maven-plugin-2.5.1.jar
Downloaded: http://repo1.maven.org/maven2/org/codehaus/mojo/gwt-maven-plugin/2.5.1/gwt-maven-plugin-2.5.1.jar (181 KB at 78.2 KB/sec)
Downloading: http://repo1.maven.org/maven2/org/codehaus/mojo/gwt-maven-plugin/2.5.1/gwt-maven-plugin-2.5.1.pom
Downloaded: http://repo1.maven.org/maven2/org/codehaus/mojo/gwt-maven-plugin/2.5.1/gwt-maven-plugin-2.5.1.pom (21 KB at 44.4 KB/sec)
Define value for property 'groupId': : com.example
Define value for property 'artifactId': : HelloGWT2.5.1
Define value for property 'version':  1.0-SNAPSHOT: : 
Define value for property 'package':  com.example: : 
Define value for property 'module': : helloworld
Confirm properties configuration:
groupId: com.example
artifactId: HelloGWT2.5.1
version: 1.0-SNAPSHOT
package: com.example
module: helloworld
 Y: : y
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Archetype: gwt-maven-plugin:2.5.1
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.example
[INFO] Parameter: artifactId, Value: HelloGWT2.5.1
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: package, Value: com.example
[INFO] Parameter: packageInPathFormat, Value: com/example
[INFO] Parameter: package, Value: com.example
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: module, Value: helloworld
[INFO] Parameter: groupId, Value: com.example
[INFO] Parameter: artifactId, Value: HelloGWT2.5.1
[INFO] project created from Archetype in dir: /Users/hrendoh/workspace/HelloGWT2.5.1
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:29.365s
[INFO] Finished at: Fri Nov 01 16:48:36 JST 2013
[INFO] Final Memory: 7M/81M
[INFO] ------------------------------------------------------------------------
$ cd HelloGWT2.5.1
$ mvn gwt:run

ant devmodeした場合と同じく、”GWT Development Mode”が起動します。

参考:
Compile GWT application into JavaScript