Danny if you copy your activision folder from the c drive to you desktop and call it avtivision test you can then install the patch to it and play the new maps without effecting your original game . me and timmie have just had a quick run around on the new maps.
the patch that was released Wednesday is the same as the one released Thursday the only difference is Thursday is the official release day. the only reason you shouldn't install the patch is if you play in a clan that is using dedicated servers then its best to wait until the clan servers are updated so you don't miss any matches you might be due to play, but if you really cant wait then just follow the instructions in a previous post in this thread.
Yo Danny checkout the new zombie server .