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When marking up Product data, as a recommended property you can include a nested Offer. One of the recommended properties for Offer is availability, which allows you to specify the current stock availability of the item. Google have now updated this property to allow BackOrder as an allowed value.
Google added the recommended property of gtin (Global Trade Identification Number) as an applicable global identifier. The gtin property generalizes the earlier gtin8, gtin13 and gtin14 properties (which are also still supported by Google).
Separately, the documentation was also updated to clarify that isbn is only a valid property on Book.
If you include a specific price (not a range) in your Product structured data, Google will now automatically calculate when a price has dropped (based on the running historical average of your product's pricing). In their example, Google show this as 'Price: $200 (typically $300)'.
Currently only available in the US, in English, on both desktop and mobile devices.
You can now add shipping costs and estimated delivery timeframes, which can appear in the Overview and Stores tabs for a specific product result. Currently only available in the US, in English, and on mobile devices.
Guidelines update to clarify that Product rich results are only supported for single product pages, rather than pages with a list of products (e.g. ecommerce category pages). Also made significant changes to the data type definitions, adding in Offer and AggregateOffer.
In the Product structured data documentation, clarified that one of the following properties is required: review, aggregateRating, offers. Changed the expected type for brand to be Brand or Organization (Thing is still accepted).