"Discovery" is a touchy word in physics, especially when it comes to Higgs. As we noted last month, there's a scientific threshold called 5-Sigma that scientists use as a benchmark to prove that they've discovered something. And back then, there were rumors that experiments of the Higgs resulted 4-sigma signals (one notch down), and scientists were speculating whether or not these multiple 4's would trump a 5-sigma and perhaps trigger "discovery," and how exactly CERN would spin it.
From today's report, it looks like scientists say they have proof of the Higgs but are still holding back on trumpeting its "discovery." Apparently it's not unlike saying that we have proof that dinosaurs exist (fossils, footprints, etc.), but because particles aren't as tangible as a Tyrannosaurus leg, physicists have to resort to saying that there's "proof."
"I agree that any reasonable outside observer would say, `It looks like a discovery,'" British physicist John Ellis, a professor at King's College London who has worked at CERN since the 1970s, told the AP. "We've discovered something which is consistent with being a Higgs."

resulted 4-sigma signals (one notch down),

But if the calculations are indeed correct, said John Guinon, a longtime physics professor at the University of California at Davis and author of the book "The Higgs Hunter's Guide," then it is fair to say that "in some sense we have reached the mountaintop."