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Google added a new recommended property of author.url, which allows you to specify a link to a web page that uniquely identifies the author of the article, such as a social media profile or a bio page on the website. This author URL acts as a node identifier, and allows Google to disambiguate the correct author of the article.
On their Article structured data documentation, Google updated the required properties for AMP pages, to clarify that publisher.logo can be either a URL or ImageObject, and added examples for each.
Note that the requirements themselves have not changed, it is just a clarification to more accurately reflect that they understand both raw URLs as well as ImageObject markup.
Google's RRT now works with Article structured data on AMP pages. Documentation also updated, removing the following recommended fields: description, publisher.logo.height, publisher.logo.width.