Yellen is almost certainly in.
Apparently, Summers felt that the process would have been too acrimonious. Politico
speculates that the decision has much to do with Democratic opposition.
The bigger picture: Some Dems are starting to understand, finally, that Obama isn't a real Dem. First on Syria, now on this issue: Democrats are starting to treat this president as they would treat a president from an opposition party.
Here's the bad news: There's some talk that Obama will go for Tim Geithner instead of Yellen. Yow! Give me Larry over Timmy any day of the week...