Instant Previews is a quick way to get a visual overview of the search results before you click on them. Since its launch in November 2010, Google made a number of improvements:
- Flash is now supported–for most previews, Google will render a screenshot of the flash component in the preview, rather than just displaying a puzzle piece icon.
- Instant Previews is now integrated with Google Quick Scroll. Users who have Quick Scroll installed (either as a Chrome extension or as part of Google Toolbar) can click on a highlighted area within an Instant Preview, and Google will scroll you directly to that section of the page.
- Instant Previews can now be used on mobile devices, Android tablets, iPads and the Opera browser.
- Previews support additional result types, including .doc and .ppt files; and video results have a new, playable interface.
Also, note that, Google Instant is now available for more people around the world. Signed-in searchers in the British Virgin Islands, Ghana, Greenland, Kenya, Lichtenstein, Luxembourg, Nigeria, Senegal, South Africa and Uganda will see results faster with Instant, and French searchers will now see Instant results even when signed-out.
[Source: Google blog]