It's pretty but quite limited. I've heard it referred to as a prototype and I think it was the first introduction of the GWT console to jBPM.
Correct, shortly after 3.3.1, the choice was made to not develop the GWT console further on jBPM 3.3 and focus on compatibility with jBPM 4
Is there a more advanced GWT console that will work against the 3.1.1 schema?
Well, no not specifically. Maybe you could find those parts that made it compatible with 3.3 in the source and extend that so the console for 4.x also works with 3.3. Keep in mind that you will always have to keep updated yourself.
It seems to make more sense to wait until jbpm.esb catches up with jBPM-4. In the meantime we just get the GWT console up to par with the JSF one.