Jeff Gothelf manages to dovetail pure agile methodology with UX techniques like prototyping and user testing. Lean UX has a lot of great sections on the concepts of UX and agile. However, there is also plenty of concrete examples taken from the author's own experiences.
Overall, Lean UX is an easy read and a good guide for meshing rapid development while maintaining focus on the end user. It's a well written book that is actually useful for project managers, systems engineers, and designers. There is nothing particularly new in this book, just old principles integrated with one another in new ways. Sometimes, that's all it takes to be truly innovative.