The same, but different
The Canon EOS Rebel T4i's body is very similar to the T3i's; the biggest difference is on the inside, with the new hybrid sensor. The sensor has the usual set of nine phase-detection autofocus sensors in the center, but adds a larger set of contrast-detection AF sensors around them for use with the new STM lenses, like the 18-135mm f3.5-5.6 shown here. The lenses include a stepper motor for silent AF operation during movie shooting. Support for contrast AF allows them to perform continuous AF during movie capture as well.
New lens
The second STM lens that Canon's announcing with the T4i is a 40mm f2.8 (60mm equivalent) pancake. It doesn't have image stabilization, but it's quite inexpensive at $199.
Pancake lens
The 40mm lens is so thin there's barely room for the AF/MF switch on the barrel. Personally, I'd rather have it be larger with OIS, as it seems silly to intentionally work to make a lens this thin on such a large body.
Microphone
It also now has a prominently placed stereo microphone.
Movie friendlier
The camera still has a specific movie mode, but Canon moved it from the awkward spot on the mode dial to the easier-to-get-to location on the power switch.
Touch screen
The other major upgrade to the T4i is a very well-implemented and smoothly operating touch-screen interface.
LCD
The camera keeps the series' articulated LCD.
Back controls
The thumb rest is a little larger than the T3i's and the buttons have a slightly different shape, but otherwise, the T4i's control layout is identical to the T3i's.
Ports
The USB and HDMI connectors.
Ports
Remote control and microphone inputs.
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