Google Images is now showing fresher images for search results that are trending and/or news related.
Google has labeled fresh web search results with "X minutes or hours ago" for years now. But this is the first time I have seen Google do so with Google Images.
For example, in the screenshot below, if you search for [schwartzel masters] in Google Images, you will find tons of images from the golf tournament yesterday. They are all fresh images, mostly pulled from news sources, mostly time stamped with phrases such as "3 hours ago," and so on.