Hands-on Preview (Summary): "Externally, the Canon T4i looks pretty similar to the T3i. Size and weight are little changed, and most controls are in the same places, although the Movie mode jumps from the Mode dial to the Power switch, and the Display button vanishes. ...
There are quite a few other important changes, as well. The Canon EOS T4i is the first Rebel-series model to receive a new DIGIC 5 image processor, said to be around five times faster than the previous DIGIC 4 chip. This extra performance is harnessed to allow both faster burst shooting performance of up to five frames per second, and a wider ISO sensitivity range of 100 to 12,800 equivalents (expandable to 25,600 equivalent; movie capture is limited to a maximum of 6,400 equivalent, however). ..."
