I am not sure if this is new, but when you look at the first search suggestions given to you by Google and then look at the second set of search suggestions, Google will change them, assuming you were not happy with the first set of results. Google Operating System just pointed this out and I have never seen it mentioned prior (doesn’t mean it hasn’t been mentioned prior).
Here is an example of this in action:
(1) Search suggestions by Google for the word [search]:
(2) Then I land on the search results page and try it again, and notice that the suggestions are different: