I think that what is significant is that they didn't really want us to know about it. In the article, it made it seem as if the researchers were only able to observe the chimps using tools, because they weren't aware of the humans' presence. The language thing actually reminded me of a segment of The Baby Whisperer. This super nanny's book has a chart in it that explains the meaning of different baby sounds/cries. She describes hunger cries, uncomfortable cries, and pain cries, to name a few. Generally, we can't even understand our babies, so it's no surprise we have difficulty believing animals can communicate.
I think the use of language and tools by chimps is significant because it shows us where we started.
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