As you probably know the Exposure Draft of the PMBOK v6 Guide is making its way through review at the moment. I have been working with the PMI on some iterative, adaptive and agile content and look forward to when the non-disclosure agreements are lifted and I can tell you all about it. I think I can state, without saying too much, that people can expect to see a natural evolution of mainstreaming techniques that are now considered common practice.
Looking through my web site visitor statistics it is clear that one of the popular resources is my PMBOK v4 Guide to Agile mappings. These were created many years ago to support a training course I used to run for project managers operating in environments governed by PMBOK v4 Guide processes.
A couple of years ago I updated the "Agile Guidance for the PMBOK V5 Guide" but did not share it publicly because it is just as easy to misuse it as use it. It is NOT a how-to-do-agile in a PMBOK based company, a project executed only through the steps discussed in the guide would be a nasty Franken-process that is neither agile or plan based. Instead, it is a thinking tool and discussion guide only for people operating in environments with both plan-driven and agile type. With that prefix and warning, my agile discussion of the PMBOK v5 guide can be viewed and downloaded here: Download Agile and PMI PMBOK v5 Guide Alignment.