Searches that involve situations with constantly-updating details (such as breaking news) or are otherwise in a state of flux also have content advisories now. So, if the system isn't confident in the results (due to the reported details changing often), it will give you a heads-up and recommend checking back later when more details have been verified.
Lastly, there's Google's push to promote information literacy, which isn't really a change to the search but is still relevant. It's begun a partnership with MediaWise (from the Poynter Institute for Media Studies) and PBS NewsHour Student Reporting Labs to release a free weekly lesson plan for middle school and high school teachers to review with their students to help everyone better understand how to verify what they read online.
References:
GrowVisory.org
Impactively.com
Impromise.org