Google has to sue Yahoo!, right? She has to be walking away with trade secrets for local and search.
There's a possibility this is a coup by Google - if Yahoo defects to Google search engine it's nearly checkmate for Bing.
Remember, Melissa and Page were once a thang: http://gawker.com/152210/editorial-googles-power-couple
Regardless, I wish the best for Yahoo and Marissa. It would be good to have a strong Yahoo back in the scene - lots of incredible talent there.