Implications of Georgia runoff timing

[Mr. Morden]

So apparently the Georgia runoff isn't until Jan. 6, *after* the new Congress is sworn in.  Assuming the Senate race goes to the runoff, can someone explain how this is going to work?  The seat just becomes vacant on Jan. 3rd until the runoff is held?

And what about the committee assignments, election of the Majority Leader, etc.?  What happens if, say, control of the Senate flips based on the outcome of that runoff election?  A Majority Leader is elected, committees are drawn up, etc., and then a few days later control of the Senate changes, and they revote on all of that stuff?  Or will they even be able to revote?  It's not always so simple, because it depends on what gets passed in the organizing resolution on the first day of the new Congress.  Recall back in 2007, when there was talk of the threat of the Senate flipping because of Lieberman potentially flipping parties:

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In principle, I think whoever has a majority on Jan. 3 can organize the Senate however they like, which means that whichever party has the majority on that day could complicate matters for the other party, should they subsequently gain control later in the session.  At least, that's my understanding.  But if any of you are more knowledgeable about this, please explain.

[True Federalist (진정한 연방 주의자)]

Do you really think either party would be idiotic enough to hand their opponents the club they'd have if they clung to power while in the minority?  If this was the House, maybe, but not the Senate.