This is a big one. However; because it is located in the Virtual Machine itself, we can mitigate any possible damages until it is fixed by simply running a good AV on the Windows host machine and not using the Shared Folders feature unless we run it on a removable drive that we can scan after the files are put there or accessed. At least that's what I'm told so far.
The part of VM Ware's site dealing with this has been temporarily slashdotted by folks wanting to know. I'm sure we'll be able to get clear information by the morning, but for now it's out of reach. And VM Ware has said a patch is coming within two weeks, so a temporary workaround is tolerable. That's as good a time frame as companies like Microsoft can give us when they are caught in a Zero Day situation, though everyone would like to see it sooner rather than later.