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Wirelessly posted (iPhone 4S: Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3)

I can't imagine Siri taking up that much conversation as to warrant its own forum. The iOS 5 forum should be sufficient.
 
How about a new sub-forum under iOS 5 for Siri

Many members don't have Siri and there is a great deal of discussion.
 
If anything, should people be directed to post about Siri in the main iPhone forum since Siri is specific to the iPhone and not iOS 5?

The way I see this is that the iPhone forum is dedicated to hardware related discussion, whereas iOS 5 concentrates on software. Deep down, Siri is purely software and only available for iOS 5.
 
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