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Maybe youre right I dont know. It's a bit premature but I would expect native as opposed to reverse engineered AF to work better (as with IS for that matter). But who knows, maybe the Canon EOS-M engineers are isolated from the rest of the company, could be, why not. They designed a soap, maybe a good looking one, but with so many faults.
Here's the preacher Pelle in the band Hives at Jools Holland with the song "Hate to say I told you so"
http://youtu.be/Ux0Ay9eNILQ?hd=1 (fullscreen and a lot of noise please)
The EOS-NEX adapters don't offer AF, only IS and Aperture control (and IS effectiveness depends on the lens, not the body) but remember that the EOS-M has Hybrid-AF, which only works well with STM lenses (all 4 of them, 1 EF, 1 EF-S and 2 EF-M lenses) on both the EOS-M and the Rebel T4i (which shares the EOS-M's AF system for LV and Video modes). Don't expect good AF performance from the non-STM lenses, it'll probably be as slow as non-Imager AF 4/3rds lenses are on the Oly m43 bodies (and remember, Olympus has been working on this a LOT longer than Canon and still hasn't found a solution to getting fast AF with a CDAF system, which is fundamentally what the EOS-M has, the on-chip PDAF Canon went with is an assist, not a primary focusing system like Nikon's 1 series)