Lots of the press is focused on the fact she's a woman CEO - but more important is she's been one of Google's #1 product people since really early on. Hopefully it'll actually make Yahoo focus on product again and get away from the "audience" focus. Larry and Sergei probably not happy campers right now...!
Seems like there should be some penalty for changing and also a weight on the opportunity to do so. Presumably if nobody is changing lanes at all and everybody is proceeding at the same speed it's very hard to change lanes at all!