Make sure you don't lose your Rich Results.
Sign up for alerts to stay on top of changes for Google Rich Result requirements and Schema.org updates.
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.