I tried build 2011-12-12_16-41-07-H58. However, when I invoke Preferences > JBoss Tools > JBoss Tools Runtime Detection the resulting server config doesn't contain JARs that are configured in Preferences > Server > Runtime Environments > Default Classpath Entries. For instance I added:
Name: JBoss EJB3 Extensions
Root Directory: modules/org/jboss/ejb3/main
Includes: */.jar
The resulting classpath should contain jboss-ejb3-ext-api-2.0.0-beta-1.jar being located in $JBOSS_HOME/modules/org/jboss/ejb3/main.
I'll attach a screenshot to illustrate the issue.