It looks like the Zombieland series is being made after all... but it will be an Amazon original series. I'm guessing that means it will possibly be a free to watch series for their Amazon Prime subscribers, either that or it will cost everyone a few dollars an episode. I highly doubt Amazon would put the money into an original series and then stream it with commercials. My guess is this series fall into the $1.99 an episode category.
http://www.comingsoon.net/news/movienews.php?id=99155
Would you pay to watch a Zombieland series?
http://www.wired.com/dangerroom/2009/12/pentagon-zombie-pigs-first-then-hibernating-gis/
Before you know it, this will mutate into a T-Virus like in resident evil.