hmm Yes.. Drools flow is a community project right now, but it has a great community around. You can join the mailing list to see all the activity. And as far as I understand there will be a rebranded to jBPM5 and productized. Take a look at the following links:
http://blog.athico.com/2010/10/here-we-go-first-jbpm5-snapshots.html
http://blog.athico.com/2010/10/jbpm5-and-bpmn-20.html
http://enterprisebpm.blogspot.com/2010/04/announcing-jbpm-5.html
And remember Drools Flow is not just BPM, you can also take advantage of all the features inside the Drools Platform (Business Rule Engine, and Complex Event Processing features).
So I strongly recommend you to check out Drools as a platform and the jBPM 5 snapshots, you will notice a lot of similarities between them :)
Greetings!