The new model called “OneSearch 2.0” was revealed during the CTIA Wireless trade show in Las Vegas. As for what it means, the search methodology itself is now more of a meta-search, offering instant information access. Yahoo is also adding voice searching, which probably has a lot of potential for mobile applications. As you may know, not everybody is super comfortable typing words using a cell phone keyboard.
If Yahoo wants to get a stronger foothold in the market and wants to continue fending off Microsoft, this is probably the perfect avenue for them as there's tremendous growth foreseen in the mobile market.