I tried to run the sample attached to the 7th reply in the linked forum thread, using "appclient.bat" (which was made functionable in snapshot of 2012-04-10).
Everything works fine, but in the console output, I see this exception:

20:52:17,156 ERROR [org.jboss.as.appclient.logging] JBAS013202: Error closing connection: java.io.InterruptedIOException: Interrupted while waiting for close to complete
at org.jboss.remoting3.spi.AbstractHandleableCloseable.close(AbstractHandleableCloseable.java:180) [jboss-remoting-3.2.4.GA.jar:3.2.4.GA]
at org.jboss.as.appclient.service.LazyConnectionContextSelector.close(LazyConnectionContextSelector.java:88) [jboss-as-appclient-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
at org.jboss.as.appclient.service.ApplicationClientStartService$1.run(ApplicationClientStartService.java:148) [jboss-as-appclient-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
at java.lang.Thread.run(Unknown Source) [rt.jar:1.6.0_31]

Attached is the full console output of the appclient run.