current dslrs use a half polarised mirror to send some light to the view finder above and some to the focus module below it. This does away with all of that and while focusing on current dslrs is slower in live mode i really doubt that would be a problem here.

The main sensor probably operates in a reduced and faster capacity for speed of focusing and display and then will wake up the whole sensor for the photo.

keep in mind this is still an entry level camera so it will be relative to ... the 1000d, and the d5000 and the km and all that type of kit.

but id not be surprised to see the 5d mk3 going this way as the camera shutter motion is softening your images with camera shake by about 70% currently.