writes "I wasn't actually aware that Dr. Tim White of UC Berkeley had been 'sitting' on A. ramidus but apparently he has (I remember the original flurry of interest back in the '90s when it was announced), but now Dr. White and others have assembled a nearly complete skeleton of the 4.4mya specimen and the descriptions being carried by the NY Times and the AP are intriguing. Ramidus is clearly differentiated from the other Great Apes and also more primitive than A. afarensis (Lucy), providing a nice linkage backwards to the last shared ancestor between humans and chimpanzees. According to the NY Times, a whole passel of papers will be published in tomorrow's Science magazine describing A. ramidus."
Update — 10/01 at 22:05 GMT
: Reader John Hawks provided a link to his detailed blog post about Ardipithecus
, which contains a ton of additional details not covered in the above articles.