Based on todays keynote, do you think this means that all ios6 supported iDevices (iPad 2, iPhone 3GS, iPhone4) will be able to have the siri function?
nope, its just 4s/iPad 2 and up
From Apple's own site
Siri will be available only on iPhone 4S and iPad (3rd generation) and requires Internet access. Siri may not be available in all languages or all areas, and features may vary by area. Cellular data charges may apply.
http://www.apple.com/ios/ios6/#siri
Based on todays keynote, do you think this means that all ios6 supported iDevices (iPad 2, iPhone 3GS, iPhone4) will be able to have the siri function?