[shuttertalk]

Not sure what size sensor but I think it would be different to APS-C because it has a new mount, the EF-M. Note the white dot, as opposed to the red dot for EF and white rectangle for EF-s.

Part of me is happy because it will be a purpose built lens mount, instead of using lenses that were designed for a much larger sensor.

Then again that means that you can't share between systems, and people with DSLRs will need to invest in a new system. Kinda like the Nikon 1.