The report suggests Apple is looking to challenge Google's lead in features such as Google Now... Apple's machine learning efforts are in large part built with Siri in mind...
How com Siri is the only thing that comes to everybodys mind when talking about machine learning and AI?
Machine Learning and AI have very little to do with what Siri needs. Steering cars on the other hand...
Anyway, they will probably hit the wall at 95% detection rate like everyone else. Don't be too excited.