To clarify the previous post, and as AgNa and many others have pointed out, not only has the December 2nd Buenos Aires date changed to December 1st, but it has also changed venues (theoretically).
FM Kabul reports that the new venue is the Luna Park, as opposed to Club Ciudad.
The official tour page, however, still reports a to-be-announced venue.
Also of note, Josh "Swivel Hips" Homme has some nice words about the QOTSA/NIN tour. Thanks, Matt.