Just updated to latest Perforce plugin 1.0.17 from a customized version of 1.0.16-snapshot. I have to modify the LabelBuilder.java file to add a "@" in the revision line. Not sure if this was the place to do it but it worked. If you label from Hudson the "Revision: " field gets the changelist properly but when you "Show List of Files" from p4gui you get "Unintelligible revision specification '35490'."

svn info LabelBuilder.java
Path: LabelBuilder.java
Name: LabelBuilder.java
URL: https://svn.dev.java.net/svn/hudson/trunk/hudson/plugins/perforce/src/main/java/com/tek42/perforce/parse/LabelBuilder.java
Repository Root: https://svn.dev.java.net/svn/hudson
Repository UUID: 71c3de6d-444a-0410-be80-ed276b4c234a
Revision: 26518
Node Kind: file
Schedule: normal
Last Changed Author: stimms
Last Changed Rev: 18436
Last Changed Date: 2009-05-26 13:21:07 -0400 (Tue, 26 May 2009)
Text Last Updated: 2010-01-04 10:05:28 -0500 (Mon, 04 Jan 2010)
Checksum: c833a35dbd3c7bce29dff8a7703830e8

[scott@osmium parse]$ svn diff LabelBuilder.java
Index: LabelBuilder.java
===================================================================
— LabelBuilder.java (revision 26518)
+++ LabelBuilder.java (working copy)
@@ -91,7 +91,7 @@
writer.write("Label: " + label.getName() + "\n");
writer.write("Owner: " + label.getOwner() + "\n");
writer.write("Description:\n\t" + label.getDescription() + "\n");

• writer.write("Revision: " + label.getRevision() + "\n");
  + writer.write("Revision: @" + label.getRevision() + "\n");
  writer.write("Options: " + label.getOptions() + "\n");
  writer.write("View:\n");
  for(String view : label.getViews()) {