Yahoo! is currently testing real time search assist.
From SearchEngineland :
Now In Testing With Select Users
Shashi Seth, senior vice president of Yahoo Search products, told me about 5% of Yahoo’s users are currently being opted-in to the new experience and that Yahoo is also testing various versions of it.
Testing will likely continue for a month or two until a final product is rolled out to the public, Seth said. Later this week, Yahoo plans a blog post with more details about the service.
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