I hope they offer versions without cameras, too - there are a number of businesses that don't allow products with cameras for security reasons and this market is basically out of Apple's reach due to every product having a camera...then again, the iPad may not be best-suited for that. I know a camera-less BlackBerry exists on most carriers, as do camera-less dumbphones.
I'm sure Apple would allow businesses to disable the camera. Apple already allows businesses to make company-exclusive apps to fit their needs. Disabling the cameras shouldn't be too different.
As for a back-facing camera, it is not just for taking photos. People shouldn't really look at it in that way. Holding up an iPad to take photos would be kinda silly. However, a back-facing camera would be great for showing people your surroundings during a FaceTime session. Just like the iPhone 4, you would be able to switch to the back-facing camera and show people what you are looking at.