The chinese knew this already....the homo erectus branches in China were peopled with Shovel toothed specimens just like themselves.....
There are to types of the 'shovel' teeth, Sindont and Sundont(sp.). The Sindont is a branch off the Sundont family and are the Northern Asians and are characterized by flatter faces, the peculiar eye lid and lighter skin. My hunch is that this occurred in an isolated group in the north during the LGM.