If it's true, which it may very well be, we can expect the video of such in a day or two.
To say that it is a beheading is mild. These types tend to remove the head by carving and slicing with a knife as opposed to a single blow with a beheading sword. It's quite a cruel and gruesome thing to see.
Unfortunately I believe we will be seeing more of this sort of thing in the future. It always baffles me to understand exactly what these characters hope to accomplish by such acts.