What's changing?
Starting on or after 
July 23, 2015, if you are using v201506 of the AdWords API, then 
FeedMappingService.get and 
FeedMappingService.query will return 
FeedMapping objects created for location targeting. These 
FeedMapping objects will have 
criterionType 77, and will not have a value for 
placeholderType. There will be no change in behavior for v201409 or v201502.
You will start seeing these objects if either of the following is true:
  - You created a Feedlinked to your Google My Business account.
- You created a Location targeting feed through the AdWords user interface, under Shared library -> Business data.
Why the change?
Starting with 
v201506, 
LocationGroups.feedId is required if your matching function includes a 
LocationExtensionOperand.
Specifying a 
feedId in this situation allows AdWords to target the areas surrounding the locations in a location targeting feed. This may be the same feed you are using for location extensions, or a separate feed containing additional locations you want to use strictly for targeting. The key point is that the 
Feed referenced by 
LocationGroups.feedId must have a 
FeedMapping with 
criterionType 77.
What should you do?
If your application retrieves 
FeedMapping objects, make sure it will properly handle objects where 
placeholderType is null and 
criterionType is set.
If you want to create 
LocationGroups objects that use a 
LocationExtensionOperand, you can now use 
FeedMappingService to find the ID of feeds that have a 
FeedMapping with 
criterionType 77.
Learn more
Check out the following resources for more information on Location Groups:
Still have questions?  Feel free to visit us on the 
AdWords API Forum or our 
Google+ page.
 - Josh Radcliff, AdWords API Team
 - Josh Radcliff, AdWords API Team