I read in a post on the New York Times that Microsoft wants to take over or at least make a partnership with them to counter the overwhelming presence of Google. I guess that can create a Big Bang. the final quote is “Microsoft has better technology. They have innovation. And Yahoo has the customers’ data, the social media and the community.”, we'll see what happens but it all looks promising.
You can read more about it here: http://www.nytimes.com