Incompatible with eclipse Luna / google app engine maven integration?

[rdwallis]

I just installed eclipse Luna and the GWT Plugin.

The gwt plugin has a new feature Google App Engine Maven Integration which eclipse says is incompatible with gwtp-eclipse-plugin.

To reproduce install eclipse Luna, install gwt plugin with app engine maven integration then try to install gwtp-eclipse plugin.

Full error message:

Cannot complete the install because of a conflicting dependency.
  Software being installed: GWT-Platform Tools (GWTP) 1.1.9.beta (com.arcbees.plugin.eclipse.feature.feature.group 1.1.9.beta)
  Software currently installed: Google App Engine Maven Integration 3.7.0.v201407290036-rel-r44 (com.google.appengine.eclipse.wtp.maven.feature.feature.group 3.7.0.v201407290036-rel-r44)
  Only one of the following can be installed at once: 
    Maven Integration for Eclipse 1.4.0.20130601-0317 (org.eclipse.m2e.core 1.4.0.20130601-0317)
    Maven Integration for Eclipse 1.5.0.20140606-0033 (org.eclipse.m2e.core 1.5.0.20140606-0033)
  Cannot satisfy dependency:
    From: GWT-Platform Tools (GWTP) 1.1.9.beta (com.arcbees.plugin.eclipse.feature.feature.group 1.1.9.beta)
    To: org.eclipse.m2e.feature.feature.group [1.4.0.20130601-0317]
  Cannot satisfy dependency:
    From: Google App Engine Maven Integration 3.7.0.v201407290036-rel-r44 (com.google.appengine.eclipse.wtp.maven.feature.feature.group 3.7.0.v201407290036-rel-r44)
    To: org.eclipse.m2e.wtp 0.0.0
  Cannot satisfy dependency:
    From: m2e - Maven Integration for Eclipse 1.4.0.20130601-0317 (org.eclipse.m2e.feature.feature.group 1.4.0.20130601-0317)
    To: org.eclipse.m2e.core [1.4.0.20130601-0317]
  Cannot satisfy dependency:
    From: Maven Integration for Eclipse WTP 1.1.0.20140611-1646 (org.eclipse.m2e.wtp 1.1.0.20140611-1646)
    To: bundle org.eclipse.m2e.core [1.5.0,2.0.0)