iOS fans who are insanely jealous of Android users because of Google Now may have something to look forward to. A video of what appears to be a commercial for Google Now iOS was posted to YouTube, then immediately pulled. It could be a fake, but Google is not known for keeping their best features to one platform. It makes sense that Google would release Google Now for iOS at some point, assuming Apple allowed it in the app store.
Last year Google introduced voice search on iOS that made Siri look pathetic and slow. Voice search works just as well on the iPhone as it does on Android, but iPhone users never got the full Now experience. It looks like that might change in the near future.