Over the last few months, we went through the productization process to strengthen and harden the community code, and we've been working with a set of early access customers to gather additional feedback.
With BRMS 5.3, you can buy multi-year support subscriptions and professional services, such as training and on-site consultancy. This provides you with the stability and support often required in production.
If you're interested in reading more about the difference between community and product, Mark wrote a more detailed blog about it a while ago.
All details, like the supported features and platforms, product details, etc. are available on the JBoss Enterprise BRMS product page.
We're very happy (and proud) that jBPM5 now made it into the supported product.