Based on the answers provided, not via the Apple Camera Connection Kit. At least for the setups discussed, direct wired tethering from a DSLR to an iPad through the Camera Connection Kit does not support automatic image previewing as shots are taken.

A possible workaround is wireless tethering, if your camera supports it. One example mentioned is Canon EOS Remote, which can let you view captured images on an iPad, but it does not automatically pop each new image up full-screen after every shot—you still need to tap the thumbnail or enter image review. The answer also notes this was limited to a compatible camera model at the time.

So the practical answer is: automatic wired preview on iPad via the Camera Connection Kit is generally not supported; wireless camera apps may offer partial browsing/review functionality depending on the camera.