What's new in 8.5
Litium 8.5 is a minor version of the Litium commerce platform. It contains minor features and bug fixes.
Content
Ability to support Google Analytics 4
With this ability Litium supports the Google Analytics 4 to track and analyze visit statistics on the site.

Ability to rebuild search index without interference with a live environment
With this ability it is possible to rebuild the search index in Litium Search in offline mode to avoid interference with the customers.

Ability for system to heal when cache is out of sync from database
Ability for the system to heal in case that the cache have been out-dated from the information that exists in the cache. After the system have invalidated the related entries in cache the caller can try to execute the operation again.
Ability for system provide mark-up for better performance, accessibility and SEO
With this ability Litium provides better markup for the web browsers with the goal of achieving better performance, accessibility and SEO. Primary menu ahs improved markup and both image caeousel and lightbox are rendered with responsive images.

Before 8.5 - product category page measured in Google Lighthouse on default demo site

After 8.5 - product category page measured in Google Lighthouse on default demo site
Ability to set "follow" as default for new pages in CMS
With this ability the ranking in search engines like Google is improved, by instructing search engines to crawl content and links in pages as default.
Ability to create responsive image element
With this ability performance in site speed is improved by using responsive image elements, which are used to deliver multiple versions of the same image that match different screen-sizes. The browser will select the best fit image depending on the viewport width, container width and dpi setting.
Ability for system to add alt text on images
With this ability the alternative texts on images are set in the Accelerator by using information from the image description in Media for images for products, as well as for images in pages and blocks. This increases the the accessibility of the accelerator, but also increases the ranking in search engines such as Google.
Ability for system to use payment provider with checkout widget without receiving address information from the widget
The behaviour of the checkout page has been changed to improve the handling of customer details. A "Continue" button has been added to the customer details form. Loading of any payment or delivery widgets are deferred until the customer details form has been completed. Also, the checkout page automatically adapts to the integration type of the configured payment and shipping options.

Ability to migrate to Litium 8 from previous versions (generally available)
Many bugs have been fixed and so this ability is now marked as generally available, instead of Beta.
Bug fixes and improvements
Around 20 bug fixes and smaller improvements.
See the release notes here