Inch by inch, model by model, Canon is slowly dragging the DSLR toward its destiny: a full-fledged photo-video hybrid camera. We're not there yet, but the $US800 600D brings shooters a bit closer with a video-centric swivel out screen.
First thing's first: If you have a 550D, don't freak out. You've still got a killer camera. The 600D has the same blood & guts as its predecessor, just in a spiffier, more video-oriented package that pulls in the swivel screen from the slightly more upper level 60D. It's got the same 18-megapixel image sensor, same focus points, same video specs (1080p @ 24 or 30fps, 720p at 60fps, etc.).
So what's new? Well, that flip-out screen. I though it was pretty damn gimmicky on the 60D 'til I used it in several video shoots, but I've come to legitimately appreciate it while doing video work. The new kit lens adds another stop's worth of image stabilisation. (Kit price: $US900.) It's also got some of the filter effects from the 60D, like fake tilt-shift, fisheye and others. You can shoot in multiple aspect ratios. A new "video snapshot" feature that fire two, four or eight second video clips. I like the idea. Digital zoom while shooting video, which you can see in this sample from a pre-production unit (I'm not touching the lens at all in the clip):
I didn't shoot a ton of sampleage because we're talking the same image sensor and guts as the 550D, so the image and video quality should be the same—if it wasn't, the unit was pre-production anyway, so final judgment would need to be reserved for the final product. Besides, it was really crappy out.
Aaaaand there's new bottom-level camera, the T3, which comes in a $US600 kit. It's a relatively bare bones 12-megapixel shooter that also records 720p video. No swivel screen. Personally, I'd save up for the extra scratch for a T2i instead, which is Canon's new middle entry point, sitting between the T3 and the T3i.