Yahoo has a whole story about DC's plan, featuring some qutoes from Lee and DiDio, which you can read here.
After the zero issues are released, all books will go back to their regular numbering.
Other than making me a little nostalgic for Zero Hour, I don't really care either way about this. It's clearly a marketing ploy to get the same kind of sales bump that all the #1 issues got this past September, but if it results in new readers coming in, I'm fine with that. Marvel has their "Point One" initiative that is designed to do the same thing.
What do you think?