(see here http://interactions.acm.org/acm-seeks-editors-for-acm-interactions)
It has been some great years. It has been a privilege to work with so many outstanding colleagues in the field, famous and unknown, old and young, academics and practitioners...those who deliver what they promise and those who don't :-)
I have learned a lot. Read things I would never had read otherwise. Seen research and ideas that I would not have cared about. Met people that I would never have met. It has been fascinating, fun and enlightning. So, if you are interested, just apply! It is good to be two so you can share the work.