As cool as the news of chimps seen fashioning their own weapons to catch prey is; I see problems. Remember that ape who could communicate via sign language? Well, they just learned a better way to chat -- war. We're talking about the possibility of a chimpanzee army, in of all places, Africa. The last thing Africa needs is another species arming itself.
Though, if and when I go, I do hope it's chimp-thrown spear through the jugular.
Also, I remain unconvinced that this is an upgrade from previous hunting methods:
"standard chimpanzee hunting practice...involves chasing a monkey or other prey, grabbing it by the tail and then slamming its head against the ground."