Google is testing displaying related to recent searches in your autosuggestion or autocomplete search suggestions. So I guess Google is showing first recent searches and then followed by search suggestions based on related recent searches.
This seems like a more personalized form of Google suggestion autocompletes then what is trending or what most people are searching for.
Here is a screen shot from Shameem Adhikarath on Twitter:
I think this is useful, what do you think?
Forum discussion at Twitter.