Looks as if it's getting a new name and a new definition.
http://www.medscape.com/viewarticle/839532#vp_2
Medscape Medical News
IOM Gives Chronic Fatigue Syndrome a New Name and Definition
http://www.iom.edu/Reports/2015/ME-CFS.aspx
Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness