The Wall Street Journal is also reporting about it,
http://blogs.wsj.com/digits/2009/06/19/google-to-test-new-product-ads-on-prize-real-estate/?mod=rss_WSJBlog

I assume they'll look like the current product ads with plus boxes:
http://farm4.static.flickr.com/3274/2966682919_9c4a6bce74.jpg

http://searchengineland.com/google-adwords-now-with-images-15242

I can't wait for them to ask me.

Peter Moore
[signature removed]

And so we begin our journey to image ads on Google SERPs... :-(
Adblock, here I come...

Veky:
If you look at the screenshot, you'll notice that Google shows more information about the products (including images, videos, prices) only by request.