First we had Lucy, the first Australopithecus. The sum total of recovered bones from Lucy is 33. 5 are from the area of the head. The record regarding Australopithecus is sparse. While I would not hesitate to agree that this is an Australopithicus fossil, based on later reconstructions based on an amalgamation of other fragments found over the decades, I find it hard to see any reason to believe this fossil represents a whole new species. There's just too little solid data.
Really nice specimen though.