I bought the Canon T4i with the 18-135 mm STM lens. I unboxed it last night tried a quick test with the STM lens AF feature and the new touchscreen. I uploaded this and plan on posting a more detailed video shot with the camera in a few days. I was pretty impressed with cameras ability to rack focus on its on. Its not perfect, but under the right lighting and with the right gear, I experienced some success without touching the focus ring.