First test: Google Mobile App for iPhone: "Google Mobile App released, but doesn't play well with British accents"
(Via Macworld UK.)
And for all those people that have been clamouring for voice commands on the iPhone remember this: Apple is a global company and anything they put out for the iPhone must work equally well in the US, India, France, Germany, Italy, ...
Given that the Newton handwriting recognition fiasco is probably still smarting, Apple isn't going to release a voice recognition or command tool as part of the basic package.
That said, it leaves open the market for third parties to propose localized applications that take into account regional characteristics - and if they don't work, Apple's not on the hook.
Witness Vocalia.