i don't think anyone has posted about this since their release (i couldn't pull up anything in a search), but Wargames Factory have just released a 'modern' zombie sprue, which is somewhat easier to pass of as being part of the 40kiverse than the medieval zombies from the Warhammer range. and at $17.95 for 24 models, they seem to me well worth a look if you were planning on collecting those Plague Zombies for Apocalypse:

more details here