JSF 2.0 is not yet supported in JSF Tools. We are working on adding it for Helios. Stay tuned in this forum for updates. If you are an adopter, you can also search [JSF2.0] in the Eclipse bug database both in summary title and whiteboard field of WebTools->JSF Tools product bugs.
Note also that the Facelet incubator plugins are being folded into the main tooling as part of adding support for JSF 2.0. We will support the similar backward compatibility for Facelets 1.x as is supported in the runtime spec, but no further work will be done on the incubator plugins.