Zombies = nerd love? I thought they were more main stream than that!
I for one will be wanting to field a ton of Zombies, in horde formation. With 625 needed to be spent on Core (2500 pts), it wouldn't be too hard to field 2 units of 50 each for 300 pts. Would still give lots to be spent on units such as Dire Wolves, Skeletons or a smallish unit of Ghouls.
With such large unit sizes I figure I will be able to not worry about them as much, add in some decent combat characters to mitigate crumble, and pit them against more static CR troops. They could even be used against smaller units of more elite troops if you have a combat character or two in there. Deploy them 5 wide and the CR you give off wouldn't be as bad. Weather the storm, use your combat character to chop down their Rank and File, and eventually win.
I'm really looking forward to them. Will have to think of some Zombie fillers for sure.