I tried this tutorial to, but i saw there was a bug (see comments)
I tried jboss tools 3.0.0 CR2 and the portlet project type was not present. I tried with CR1 and it worked, maybe they didn't solve the problem?(I posted on the jboss forum)
Try to install CR1?
Look at the facet, where you pick the project type there is no portlet one anymore but next you have a button (forgot the name) where you can choose to add facets.