Make sure you don't lose your Rich Results.
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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).