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This new technology will allow DSLR users, to frame photos using the viewing LCD, while having the same accuracy and speed of a viewfinder. This is great for video buffs who will now have the added benefit of auto focus while shooting but will it be useful to the professional still photographer?
Hard to say. At the end of the day it will be up to the manufacturer. For me, and every other photographer i know. Looking through the viewfinder is what separates the amateurs from the professionals. It still makes me laugh when i see someone using a $10,000 setup in live view mode.
This new technology can be found in the new Canon eos70d
For more information on this new technology please see this document form the Cannon developers.