"Public concern" is defined VERY broadly. It's not just the Pentagon Papers, it also encompasses news about who Jennifer Aniston is dating. Basically, public concern means whatever the public is interested in, not what is worthy or meritorious of public attention. Judges don't want to be in the business of deciding what is or is not of legitimate public interest so this phrase has basically come to mean "whatever the public is interested in." Gizmodo's news falls somewhere in between; news about an upcoming product from the the third largest publicly traded company in the U.S. (measured by stock capitalization) would most certainly qualify as "public concern" even under a stricter test. If leaks about future business plans of public companies didn't qualify as a public concern, then Bloomberg, Reuters, Fox Business, etc. would all be illegal.
Again, can you cite some case law that a matter of public concern could be interpretes so broadly? The DeCSS code was found not to be a matter of public concern in the case I cited. There's another case that says a restaurant's recipes aren't a matter of public concern. There is another case that says, in dicta, that engineering specs are only a matter of public concern if they, for example, involved public safety.