A lot of getting started materials are already available. The release of jBPM 4 has not gone unnoticed.
Joram Barrez whats-new-series
jBPM4 Hello World
jBPM4: What’s new?
jBPM4: What’s new (part 2)?
jBPM4: What’s new (part 3)?
Joram also spotted and collected the following blog links. Thanks, Joram!
Jeff Yu published a great jBPM 4 intro in 3 parts:
Getting Started with jBPM 4.0 - (Part I )
Getting Started with jBPM 4.0 (Part II)
Getting Started with jBPM 4.0 (Part III)
Bernd Ruecker published a jBPM 4 showcase:
Ein kleiner jBPM 4 Showcase (In German)
Andries Inze published a demo on the Spring integration:
Spring jBPM4 CR1 Demo