Google announced today in its official Google blog release of Instant Previews. You will be able to see it in action in google.com, but not in all country specific Google versions.
With Google Instant and Instant Previews, Google hopes searchers will find what they see faster. As you type your query, if Google Instant is activated, you will see results matching the partially entered query. You will now also see a magnifying glass icon next to each result. If you click on the icon, a preview image will appear on the right.
It will cover the sponsored results, but Google claims it will not affect advertisers since if surfer sees instant results and then clicks on magnifying glass icon, it implies that paid ads are not f interest to her. The preview image can be closed to reveal the PPC Ads once again.