I believe Andrea was originally going to launch with the zombie version of the rules first but switched gears and moved the fantasy version of the rules to the top of the queue. A month or so ago I saw a post from him saying he was wrapping up Run from the Dead for release, so it seems imminent. The core mechanics seemed identical, having played both, but the modern version has some rules for handling modern weapons and vehicles (as well as all sorts of zombie-specific details, such as monster stats, etc.).