I have made the cut over to the new
http://build.clojure.org box which is running an up to date version of Jenkins, tools, plugins, etc. I believe everything is working as before. If you are a contrib owner, everything should work pretty much the same way for doing builds and releases.
While I've done snapshot builds of everything, I have not done any release builds. The next time someone does one on a contrib, please let me know the outcome (even if successful).
Also, this clears the first set of hurdles in being able to build cljc-based contrib projects, which I know many contribs are waiting on. I am working through verifying the process with test.check, which has been broken due to this for quite a while. Once we have a working process, I will have some more concrete advice on contribs that wish to provide this.