Google made two updates to their local search, both dealing with advertisements on map pages. The first is that Google is now showing ads on the expanded Local Finder results. By clicking the "More places" link in the three-pack, you will be taken to the map and ads can appear there now. This new addition allows retailers and local businesses that aren't featured in the three-pack an opportunity to get a top listing.
The second change that Google made has to do with advertising on Google Maps. They will only be placing ads that have location extensions from now on and have removed Google Maps as a Search Partner. The change will allow advertisers who opted out of Search Partners, but have location extensions, to appear on Google maps and will remove ads that are placed through Search Partners, but do not have location extensions.