Google Products - new specification

Summary of Changes
We are confident that the new feed specifications will have a strong impact on the user experience. Below are several examples of how the feed spec is changing in the United States; please note that other countries have slightly different requirements:
Availability: We’d like a user to be able to find your products even when they are out of stock. For this reason, the [availability] status of all your items will be required.
Google Product Category: We have added a new required high-level attribute called [google product category] that contains the category of the item in Google’s taxonomy (currently only required for a select number of categories). This is in addition to the current [product type] attribute.
Images: We’re making [image link] required and we encourage you to submit up to 10 additional product images through [additional image link]. This way, you can improve the visual representation of your products.
Apparel: In order to create a better experience for product variants such as dresses or shoes that are available in multiple colors or sizes, we ask you to include information like [size] and [color] in your product feed. In addition, we require you to provide [gender] and [age group].
Data Freshness: We will continue to regularly check feeds for accuracy of pricing, availability, and general product information, and take action against accounts that violate our standards.