Tartarus Station is the central hub and starting point of Claptrap's New Robot Revolution. Players can access this location by using the Fast Travel system from any Fast Travel terminal.
On July 29, 2010, Randy Pitchford tweeted that more news about the fourth DLC would be coming soon. Gearbox Software made the official announcement on August 11, 2010.
On August 4 patch 1.31 was released for PC. Within the patch files was information about potential missions, enemies and new locations for DLC 4. Original discovery by Zackh411. First added here. Original forum link here.
Subsequent exploration of the patch conducted by Legendrew available here.
There is graffiti at the foot of a red weapons chest at the top of a building just west of Marcus in Tartarus Station. The graffiti shows a Claptrap speaking binary in a speech bubble. The binary translates to "Steve the Bandit". Picture of Binary
Some billboards have a red poster with a message in binary "01110010 01100101 01110110 01101111 01101100 01110101 01110100 01101001 01101111 01101110" which translates to "revolution."
There is a pedestal that has a statue of INAC, which has binary on it, which translates to "Viva la revolution".
One of the announcements is a modified version of a saying from another 2K game: "Is a claptrap not entitled to the oil of his brow?" is likely a reference to the opening speech made by Andrew Ryan in Bioshock.