I didn't realize the series had been green-lit. I'll have to check it out.
It's not greenlit yet. Amazon have made 5 pilots available for viewing and viewer reception will determine which one goes to series.
As for Zombieland, I watched the trailer and a couple of bits made me laugh. My friend watched the pilot and said it was okay with a couple of good bits. I don't really understand why they're using the same characters as the movie because it will only suffer in unnecessary comparison.