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from http://www.slideshare.net/krisverlaenen/streamline-your-business-processes-and-enhance-productivity-by-using-jbpm it seems that jbpm5 will have full production support since first four-month of 2012
Currently jBPM 3 is still the only fully supported jBPM version. jBPM4 was never supported nor will be. As mentioned above, full commercial support for jBPM5 is planned early next year within BRMS 5.3. We currently are running an early release program for jBPM5 supported bits. Please contact Red Hat for more info on this as this is a community forum and you may be able to get much more accurate info that way regarding questions on commercial support.