Yesterday I mentioned that Microsoft had made some changes in their Live product search. It now seems that Google is also testing a new version of its Product Search with actual CSE features. This includes the aggregation of merchant offers by product, compare functionalities, technical specifications of products and reviews for products. This new version was first seen in December ‘07 by eCommerceOptimization. The changes are only visible on Google.com. On local sites of Google in Europe nothing has changed (yet).
It will be likely that Google will start promoting this service in their regular search results. Currently they still use the ‘shopping bag’ icon, but according to SearchEngineland Google is also testing with displaying the product image.