They obviously already knew who Lisa's replacement would be when they told us abut her pregnancy. They wouldn't have made a statement like, "We know you'll love them!" if they didn't. Just IMHO.
They prepare for these things. I just can't wait until they actually release info.
And Maggie has a good point with their preparation.
That is all true. That is how I felt and that is why I mentioned that they may already have someone. They may make the annoucement at the beginning of the new year. That would be a good time to do it I feel.