Consumers willing to sacrifice hardware controls for a touchscreen-driven UI won't be missing out on much else -- functionally, the EOS M is a near-clone of Rebel T4i with the same 18-megapixel APS-C CMOS sensor, DIGIC 5 processor and 3-inch touchscreen.
ENGADGET: Canon EOS M mirrorless camera hands-on (video) Hands-on