I can't imagine (and most reports seem to agree) that this would be a one off thing. Surely Malkmus has seen the example of the Pixies and figures their fans have disposable income now.
So there's another in the list of shocking reunions happening. How long til Bob and Grant decide there's a ton of money to be made in doing a reunion tour playing "New Day Rising" or "Zen Arcade" in their entirety?
Yeah, I'm with CS. When they were on Conan, they played another song off Amalgamut, "My Long Walk To Jail" (or something like that). Interesting, although his voice cracks a little funny when he screams.