Structured data markup  - 
Google made some extensive updates to their guidance on Article markup this week. There is a host of new mandatory Publisher properties, many of which require specifying a logo and dimensions. Interesting to see that "mainEntityOfPage" is now a recommended property, too.

No doubt this is in preparation for the launch of AMP next year. The Structured Data Testing Tool is already validating against these new guidelines. Properties that fail to validate include a tool tip saying "Required by:
AMP Articles"
Dan Scott's profile photoDan Brickley's profile photoAaron Bradley's profile photo
Yes, the Structured Data Testing Tool's interpretation of reality and requirements often varies from the underlying standard :)
SDTT's notion of 'required' is w.r.t. specific Google product features. itself doesn't "require" anything (it's more like a dictionary, defining meaning of terms).

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