Siri has been out since 2010 on the app store. Is there any reason (other than Apple's push with building it into the operating system) that users will take more notice of it now than they have in the last (nearly) two years?
I'm just too shy to walk down the street and talk to my phone without it looking like I'm talking to someone.
I've used Siri on and off since it came out. It's pretty good. The reasons I don't use it more are precisely the problems that will be solved by integrating it into the OS. First, the app was a pain in the ass to activate, requiring half a dozen taps to get started. This problem disappears on the 4S. Second, the app couldn't do anything with the data on the phone (like send e-mails or check my calendar) because it didn't have access, or at least they didn't build it to. Again, this problem disappears with integration.
The main advantage of something like Siri is convenience and speed. The app couldn't achieve that precisely because it was an app that wasn't built in to the OS.
Apple has added new features to integrate it more deeply with things like the Calendar and Reminders apps, but at the same time, half of Scott Forstall's demo commands at the 4S keynote were exactly the same as the Siri demo at 2009's All Things D conference.
"The secret to ending all poverty and hunger has been hidden deep in the earth's crust for two decades. Is there any reason why digging it out and placing it in Times Square for all to examine (except for the fact that now everyone can see it) will cause people to take more notice now than they did before?"
So I'd say, yes, there is a reason.