So Valve is working on a new game mode for Team Fortress 2, called “Mannpower Mode”. It is a variation of Capture the Flag and it is currently available in the beta map pool, accessible from the Play Beta Maps checkbox in Play Multiplayer. While it will change significantly over its development period, this beta launch corresponds with their Christmas promotion.
Even though it's like Capture the Flag, there are some significant differences. First, similar to many other franchises, the objective is touch-return. Fans of Unreal Tournament, Halo, and many other franchises will know that this is different in two main ways: a dropped objective will return to base instant when it is touched by a defender, and the attacker's flag must be returned in to capture the opponent's one. Second, random critical hits are disabled.
Third, grappling hooks and power-ups? I am guessing the Valve wants TF2 to be more competitive in with the fast-paced shooter crowd, so they are finding ways to increase mobility and map control within the Team Fortress 2 ruleset. Of course, that is not a criticism about TF2's game design – quite the opposite; it is different, not worse. It is interesting to think about the relatively slow characters of TF2 being used in more of a higher-reward, lower-forgiveness game mode. The updates add mobility and incentives to use it, both rewarding flag returns as well as acquiring power-ups.
Team Fortress 2 is still free-to-play, but rarely free-toupee.