It has taken a while but we now got jbosstools-arquillian up and running at http://github.com/jbosstools/jbosstools-arquillian
It is still a bit rough on its edges but now that Snjezana made it integrate
with standard launch configurations it seems appropriate to enroll it in
JBoss Tools upcoming Beta1 release.
Edges found while integrating it is recorded athttps://issues.jboss.org/browse/JBIDE-14424
Thanks Snjezana and all the 's that have given input!"
http://github.com/jbosstools/jbosstools-arquillian has some links to screencasts for what it can do - not all full uptodate integrated to latest changes but should give you and idea what it can do.
note: removed bad bad paste....see screencasts in the github repo instead