Hi Gustavo
We found a temporary solution that would allow you to install our GWT facet for Eclipse WTP. We added the older version of the google plugin, we rely on, to our additional update site.
You may install the facet by adding both update site and make sure that you dont have the latest google GWT plugin installed. All details are discussed here:
https://issues.jboss.org/browse/JBIDE-7956?focusedCommentId=12583879&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12583879
In the meantime we try to get further in our talks to google and improve the situation where we always have to follow the new releases google may publish. Stay tuned!
Cheers
André