The result set showed the maps box above the AdWords results, but also only showed Google Place pages in the search results. For some reason, it is also only showing the past two months filter, which may be why for the unusual search results.
Here is a picture of the results.
A WebmasterWorldtalks about the 'what if' this really happened and also there is a lot of speculation around the screen shot itself. Some call it 'doctored' but honestly, it likely wasn't. What is likely is that this was a limited test or someone clicked on a filter by accident causing this unlikely behavior to occur.
I personally think we do not have to worry about all the results displayed by Google ever being all leading to a Google page. Of course, many would argue.
Forum discussion at WebmasterWorld.