Keep up to date with all of that Justin Bieber news, nobody has to know
Google Now is picking up an update today with a few new features to improve your search and predictive information experience. First up is a new "hotword" that can be detected — "OK, Google" can now be said to initiate a voice search if you're in the US, although the regular old "Google" still seems to work just fine for us.
Once you've performed a search, if it happens to be for information on a "notable person" Google will offer you the ability to have new cards show up in Google Now for updates on that person. There's no indication of what makes a person notable, but we found searching some regular famous musicians and celebrities yielded the desired result.
Google also says that "more beautiful search results" are rolling out gradually, but you can get the two aforementioned features with an update to the latest version of Google Search at the Play Store link above.