I liked 28 days later quite a bit, it was a pretty inteligent zombie flick that asked brought some interesting logic into the zombie-genre. But the whole point of World War Z was to present old school zombies, slow, headshots only, and only apply the logic to it's effects on the world. And while I can understand them moving away from the 'interview different survivors'-framework, they could've kept the plot intact. "Race against time to stop it" does not sound like WWZ. Most zombie flicks are about just after the apocalypse. WWZ was set during. This movie sounds like it's set before it. That doesn't make it a generic zombie movie, but does make an even more generic action movie with the hero stopping the virus, unless of course we see Brad Pitt fail and just watch the apocalypse happening around him. That could still be cool.
And I doubt the Battle of Yonkers was cut completely, it's probably THE defining scene of the book. I'm more worried that they butcher it and forget what it's about (the army being equiped for a PR battle, and the difference in tactics neccesary to fight zombies instead of people) than that they fail to include it. If they don't include it though, the movie is DoA.