Goldrush!

From Valve: You may’ve heard that new achievements, maps, and unlockable items are on the way. The first map, Goldrush, intro- duces a new game mode. The BLU team must escort a high-tech mining cart through a series of checkpoints to the RED base within a time limit. The more BLU players near the cart, the faster the cart moves. The cart stops if any RED team member is in the vicinity. Valve are currently play-testing the map and should be out soon.

It will be interesting to see how it plays out in the TF2 environment. The interest is already sparking within the community, with custom maps being created. Here are some screen- shots from es_cave created by Spacemonkey.