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They not only will, they already do in the beta.

But the system doesn't use the entire Yelp database in the beta. Nearest locations are often 30+ miles away. Presumably this is something easily changed at launch.
 
Will locations via Siri work with iOS6 in the UK?

I'm in the UK and using iOS 6 Beta 3. I can gladly confirm that location services in Siri are working a treat. I ask Siri to find me some restaurants and it often finds local ones but sometimes it shows me some ones that are not so near. It a bit buggy but its working and it's a feature we will never live without!
 
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