Instead of switching to an entirely different interface when you go from the standard search results to Google Image Search, Google Video or Google Book Search, you'll see the same interface. There's a new left-hand column that replaces the expandable "search options" sidebar. It looks like a vertical navigation bar and it shows the most relevant specialized search engines and the most useful filters that help you refine your query.
Since November, Google has tested many versions of the interface and added features like location detection and "not entirely unlike" search suggestions. Lately, a lot of users started to see the new interface and that's a clear sign that Google will release the UI soon.
Google web search results (screenshot from April)
Google's homepage and a new logo (April)
Google's new footer (April)
Google's search results (November 2009)
Google web search results (screenshot from February)
Google News results (screenshot from February)
Google's search results (March)
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