On Friday we reported on a refresh of the local search results, after the major Google Pigeon update a week or so before. We named it the Pigeon 1.1 update and asked Google for a comment.
Google basically told us they have nothing to say on this and likely will not provide future details on local search algorithm changes.
Here are the search results for the query [ice cream] I have been tracking:
Pigeon 1.0:
Pigeon 1.1:
Today, about the same but different order:
Again, Google would not confirm 1.1 and likely won't be confirming future Pigeon refreshes.
Forum discussion continued at WebmasterWorld.