[citation][nom]chumly[/nom]...and why doesn't this software work on every other iPhone?[/citation]
I think it technically could. I mean, maybe Siri would run kind of slow on iPhone 4 with its A4 chip, but I can't think of any reason why it couldn't run on iPad 2, which is pretty speedy. This is Apple wanting people to pay for hardware to get the software (typical Apple model). If it doesn't entice you, however, don't do it!
Rachel Rosmarin
Managing Editor, Tom's Guide