Unlockable items and a new gameplay mode are on their way to the PC version of Valve's Team Fortress 2 as part of its upcoming large scale gameplay shift. According to PC Gamer, the items will become available as gamers earn class-specific achievements. As the Medic will be the first class to receive specialized achievements, it will also be the first to receive new items.

One of the two Medic-specific items will be the Overhealer, which permanently doubles a target's health capacity. To balance this, Valve is considering increasing charge time for an Uber when it is equipped. Another possibility is that the company may remove the Overhealer's Uber capability altogether.
Currently, the plan is to allow gamers access to the Overhealer when they earn about half of the 35 Medic-specific achievements, with the other as yet unannounced item unlocked after the criteria for all the achievements have been met.
The items will be available via the new Loadout menu, suggesting that gamers will not be able to easily swap between the gameplay-altering tools in the midst of battle.
Goldrush, the second of the two forthcoming maps, sports a new escort-oriented gameplay mode. In it, the Blue team must escort a mining cart from one side of the map to the other. The more Blue are around, the faster the cart moves. However, it stops dead in its tracks if even one Red is in the vicinity, with the ever-moving point of conflict is said to make a solid defense rather tricky.
The two new maps, Badlands and Goldrush, are now expected to arrive in just over a month, with the Medic achievement pack and gameplay slated to hit before then. In true Valve spirit, which appears to be unaffected despite the studio's crushing defeat at the hands of Team Shacknews, the content will be provided for free to owners of the PC version.