It's up to SIRI to market the hell out of this capability NOW! They do not have time to screw around with this. They must pounce on it immediately and go after that market, big time. Failure to launch a huge marketing campaign will be a disaster. Now is the time! They will most likely wait till their app is ready, and that's ok as long as it happens in a few weeks. If there are delays and they don't move to capture the iPhone market very soon, they will lose momentum and opportunity.