Google is testing a new Gmail ad format that prominently showcases a product in the Promotions feed in Gmail.
Once clicked, the layout displays multiple products side-by-side, each showing a product image, name, price, and average star rating, including promo labels like “Free shipping”.

This update resembles a condensed Shopping carousel within Gmail’s Promotions tab, blending native ad styling with familiar ecommerce elements.
This new format was spotted by Thomas Eccel.