Last year's Canon 650D (T4i) was a really excellent camera. But for all its whiz-bang features like a capacitive touchscreen and continuous autofocus while shooting video, it just didn't feel special. A DLSR for beginners just doesn't make as much sense when there are smaller mirrorless cameras that can achieve similar results. So Canon shrunk the 650D down. Here's the mini version, Canon 100D (SL1).
With the exception of its size the non-tilting capacitive touchscreen, the 100D is identical to the 650D. Same 18-megapixel APS-C image sensor, same DIGIC 5 image processor, same 1080p video recording with continuous autofocus.
The100D's body weighs just 407g compared to the 650D's 575g body. It measures 4.6 x 3.6 x 2.7 inches compared to the T4i's 5.2 x 3.9 x 3.1 inches. Here's what that size looks like compared to the 650D and mirrorless Canon EOS M released last year. All three of these cameras have the same image sensor and image processor.
The Canon 100D will be available next month for £570 for the body alone or in a kit with a brand new 18-55mm STM lens. (It's got the same good-for-video stepping motor technology as the 18-135 STM lens introduced with the 650D last year.) That's cheaper than a 650D, but still not quite as cheap as the tiny £500 (lens-included) SLT-58 from Sony.
One more note, the 650D is getting a name bump to 700D. The only difference is that the 700D will ship in a new kit option with the 18-55 STM lens.