Hasn't this happened in the past?? I'm not sure if I remember correctly, but I thought the 55-250 IS was also released in the USA with a delay,
because of initial supply issues? Now, the various emails simply indicate that Canon USA doesn't know when they will release the
lens. It would not surprise me if the 11-22 will be a hotseller in Asia. This lens is what makes the EOS-M system really attractive,
having UWA in a really compact form, that's where mirrorless shines. So, it would make sense to delay release in the USA, which does
not have a strong EOS-M market yet. But Canon USA would shoot themselves in the foot if they didn't release the lens eventually.
The lens lineup is part of what makes the strength of a system - no lenses => little interest (in addition to the AF issue).