PMI launched a new course, offering an introduction for free. I currently teach the PMP Exam Prep for and can tell you that Agile is being incorporated more and more in the PMBOK as part of mainstream project management. I can also tell you that you can’t let your Agile Project devolve into a “make it up as we go along” model. It will be important to all PMs to understand when Agile is appropriate and how it fits into their toolkit.

Here is a link to information on the PMI Course.