kgb2mining is correct, the arguments to RelayNodeClient.jar include the host:port of your local bitcoind and the port for the Relay Network host is not required. The java application connects on 8336 only:
[root@p2pool ~]# netstat -a |grep relay
tcp6 0 0 p2pool.domain.:45203 do-nyc1.relay.matt:8336 ESTABLISHED
Glad I could help make p2pool that much more awesome! Kudos to Matt for reaching out to me and the thread to announce the upgrade, clear up our questions, and most importantly his massive improvement to the Bitcoin network.