The Team Fortress 2 Sniper Update "Day Two" has details for a new payload mode and two new arena maps; Sawmill and Nucleus. The Sniper Update Day 2 also has a nice postcard from The Sniper to his Mum, detailing how the new payload mode works.

The new Sawmill map is described as:

Set in a stormy mountain sawmill, this arena map has its cap point in a large structure atop a hill in the center of the map; beneath which lies a hidden underground spytech base; and above which, pouring down on everything we just mentioned, is rain—the first weather effect to appear in a TF map. If that previous sentence wasn’t long enough for you, replace the period with a comma and add this next part: players must ALSO watch out for the two deadly saw blades near the cap, which were left on when the previous occupants abandoned it for a less deadly, hilly, rain-swamped sawmill not built on a spybase.

And here is the new Team Fortress 2 Arena Mode Nucleus map:

A diabolical doomsday device is the foundation of this circular arena map, which features long sightlines and a bottomless radioactive pit underneath most of the game area. The cap, located in the center of the arena, is only accessible by catwalks suspended over a chasm, which open after the timer has run down.

Oh yea, Abraham Lincoln was apparently a Team Fortress 2 admirer. Check out the full post at the official Team Fortress 2 blog.