Sigh. Even if the description is all perfectly correct, the interpretation of what this says about monkey cognition is extremely difficult. Overall, though, it's a lot better than most of this stuff — Wade quotes the right group of specialists, for instance.
Some species may be able to produce sounds in ways that are a step or two closer to human language. Dr. Zuberbühler reported last month that Campbell’s monkeys, which live in the forests of the Ivory Coast, can vary individual calls by adding suffixes, just as a speaker of English changes a verb’s present tense to past by adding an “-ed.”
The Campbell’s monkeys give a “krak” alarm call when they see a leopard. But adding an “-oo” changes it to a generic warning of predators. One context for the krak-oo sound is when they hear the leopard alarm calls of another species, the Diana monkey. The Campbell’s monkeys would evidently make good reporters since they distinguish between leopards they have observed directly (krak) and those they have heard others observe (krak-oo).
But this time, there's no need to say more here, since Mark Liberman over on the Log has posted all that needs to be said on the topic, "Chimps have tons to say but can't say it." Most importantly, Liberman appears to have coined a key new word, "doolittlery". That's one I'll be using.