According to this apple webpage, the iPad mini does support and include Siri:
Apple - iPad mini - Built-in apps
I suppose this makes sense given that it has the same guts as the iPhone 4S, but it does confuse me somewhat as to why it wasn't ever included in the iPad 2, which also has the same processing capabilities...
Edit:
Also, if you scroll down on this page, there's a whole section dedicated to Siri on iPad mini:
https://www.apple.com/ipad-mini/features/#mn_p
Apple - iPad mini - Built-in apps
I suppose this makes sense given that it has the same guts as the iPhone 4S, but it does confuse me somewhat as to why it wasn't ever included in the iPad 2, which also has the same processing capabilities...
Edit:
Also, if you scroll down on this page, there's a whole section dedicated to Siri on iPad mini:
https://www.apple.com/ipad-mini/features/#mn_p