Reply #128: There are so few well-preserved hominid fossils from that era...

[InvisibleTouch]

...that practically every new discovery will re-write the whole tree. It's not exactly being "turned on its head," though - it just rearranges a few branches and pushes the existance of an early ancestor back a bit further in time. The only thing I really see that's new here, is the evolution of bipedalism in a woodland environment, as opposed to grasslands. What advantage there might be in bipedalism for this species, is a mystery at the moment, but that's what makes evolutionary biology fun. :)