Hi Steve
Did you have the google update site installed? You need to add the following update site to your available update sites in eclipse:
http://dl.google.com/eclipse/plugin/3.6/
If you already did, you might hit a bug in the gwt integration installation:
https://issues.jboss.org/browse/JBIDE-7828
To solve that you'd have to install the gwt plugins in a first step and install the integration facet in a 2nd step. Should solve it.
Cheers
André