I just tried the new snapshot, it seems the problem still exists:

Sep 09, 2015 9:39:07 AM org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
SEVERE: The web application [horizon] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@283dc4]) and a value of type [org.jboss.weld.context.AbstractManagedContext.ManagedState] (value [org.jboss.weld.context.AbstractManagedContext$ManagedState@132a875]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.