>i thought that only pre-1982 pennies were >made of mostly copper, everything after that >is primarily a zinc alloy
You are mostly correct. Post-82 pennies are 99% zinc with copper plating; however, pre-82 pennies are still in circulation so the news report was partially correct.
The pre-82s may gradually go out of circulation, though, as the copper price goes up. I've been sorting out pre-82s for safe keeping for over a year now. Some of the 82s have copper (there were seven different combinations that year).
Incidentally, if the zinc price continues to goes up, this will also apply to post-82s. Right now, by my calculation, a post-82 contains about 7/10 of a cent of zinc. The regular ol' circulation nickel is the next closest melt v. face value, at 4 cents of copper-nickel to a 5 cent face value. (25% nickel/75% copper).