I'm guessing no large or drastic effect. It may make zincers more desirable and coppers more valuable in a numismatic sense. I'm sure each year they issue them will dilute the copper & zinc pool by similair %'s since 1982. Corrosion will be a big issue. They won't be real easy to find with a metal detector but I leave zinc pennies in the ground anyway.
Hard to say exactly the effect, but certainly it will lead to more copper cent hoarders. I am personally indifferent to whether they go with a steel cent or if they stick with the zinc/copper mix as either way I will continue to hoard coppers at the level I am now.
My hobby: collecting real money 1 copper cent or nickel at a time.