Google has announced they've added support for the schema.org markup for organization logos within the search results, specifically not the search snippets but within the knowledge graph.
So while author schema will show in the search results snippets, organization schema will only currently show in the knowledge graph box.
Here is an example:
Again, the author image shows in the snippet but the organization logo should not. Here is an author image snippet:
Here is a code sample of using organization schema:
Do not confuse the two.
Forum discussion at Google+ and Google Webmaster Help.
