A couple days ago, I read an article about a research team challenging old evolution theory. According to them, Homo habilis and Homo erectus lived at the time, side by side, in Kenya. They may not have mated each other. Homo habilis was likely more vegeterian while Homo erectus, ate some meat. If that's true, the family tree will be revamped.
I am fully aware that the human evolution map is still not accurate. We still have more fossils to study and some more fossils will eventually be discovered in the future.
Meanwhile, the theory will continue to flourish and become more accurate. Time will tell.
For further reading, click on the links below.
New York Times : Fossils in Kenya Challenge Linear Evolution
Yahoo News : Fossils challenge old evoluton theory