The new version of the DSM, which omits the specific term "Asperger Syndrome" is controversial for that and many other reasons and highly disputed at the moment by many Mental Health Professionals. Some have flatly refused to use it. The US Federal Government has indicated plans to abandon the DSM soon in favor of some other diagnostic standard.
Also, brain researchers are reporting MRI scan evidence indicating that Asperger Syndrome and High Functioning Autism have a different neurological signature than Classic Autism (also known as Kanner's Autism). Therefore, it seems virtually certain that the whole issue will be revisited and that Asperger Syndrome will likely be reinstated in subsequent editions of the DSM.
As arielhawksquill points out, Asperger Syndrome was only removed from the DSM V, which is not recognized globally as the exclusive word on diagnostic criteria, so it's not like the term or the diagnosis have disappeared from the face of the Earth.
All a fairly moot point, since Asperger Syndrome and High Functioning Autism are, and always have been, essentially the same thing. There never was any difference, except for a slight delay in speech in early childhood in HFA and not in AS.