The core pi4soa plugins are now available as part of the JBoss Tools nightly build.
On the JBoss Tools download page (http://www.jboss.org/tools/download.html) you can either select to download a zipped version of the update site, or just reference the update site location from your Eclipse environment.
When looking to download the update site locally, the page includes a 'JBossTools-Update-3.1.0.....' link at the top, and then a number of standalone downloads below. The pi4soa plugins are only included in the links at the top of the page - there is no separate (standalone) download for them.
The core pi4soa plugins that have been included are for the choreography and scenario editor support (including simulation of scenarios against choreography).
Feel free to give them a try. If you have problems installing the plugins, then please report issues to the JBoss Tools project, their user forum can be found at: http://www.jboss.org/index.html?module=bb&op=viewforum&f=201.
Any other problems related to the functionality provided by these plugins can either be reported on this forum (or jira), or to the pi4soa project itself.