Quandary

I have a dilemma. I recieved an ARC of Serenity Volume 2 from NetGalley to review, which I've finished. Their page shows the release date of the hardcover to be September 7th, this year. Most publishers want the reviews posted near the release date. However, Goodreads shows that it was originally released back in 2008. I'm guessing it's being re-released. Sooo ... do I post the review now, or close to the new release date? I'll plan to post later, but it makes me wonder what the policy is.