Another change that was not listed when iOS 7 was announced is that Siri will not be looking at Google to answer all your question but rather sits in the lap of Microsoft's Bing.
There are a lot of rumors and conspiracy theories on why Apple actually decided to ditch Google and every last of them sounds plausible so we will simply refrain on going into details. In short, Apple's virtual assistant will not only get a new look, new voice templates and extended capabilities, but will also Bing out all your questions.
The default browser search in iOS will most likely still be Google but Siri is quite a big thing and Microsoft can certainly brag about it.
Source:
GSMArena.com.