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The server load argument obviously doesn't hold up. But to remove all doubt....
http://arstechnica.com/apple/news/2...-is-siri-on-an-iphone-4s-ars-investigates.ars
Seems that average data usage per request is less than half that of a digital picture taken with the iPhone.... In some cases even much less (rta). How can server load would be a problem with Siri being available in older devices if apple is backing up hundreds or even thousands of your pictures with the stream for all iOS devices(3GS, 4, touches, iPads) and distributing them between them and even to your macs. Remember Siri uses much less data per request than 1 picture and and is single use. It is obvious that server load was not the issue.... Likewise you can easily prove that the Siri app can run on older devices as evidenced by the hack and the previous app available on the store..
I like my Mac and my iOS devices but I know when apple is feeding me crap and I won't buy it.