Valve has mentioned a contest
here. It's created by TF2maps.net, and once you play the levels you can vote on them. Some of the levels are payload race, and the rest are an old TF Classic game mode called attack and defend. It involves one team trying to take the flag (intel in this case) to the end of a level through several CPs while the other team tries to stop them from doing so. It is unclear how many winners there will be and what the winners will receive.
So, in honor of this contest we have temporarily replaced all the maps in our TF2 server with the contest maps (there are 16 of them). So come play and check them out!