Team Fortress 2 will be changing a lot. Valve has announced a public beta for new additions and other things. To join the beta you must have a copy of TF2. The changes are so far:
Three Natascha variants:
-25% damage, -25% health
Spin-up/down time increased, slowdown-on-hit effect falls off over distance.
cp_granary: new entrance added into the RED and BLU mid ramp room.
cp_5gorge: 5 CP version of cp_gorge.
Misc balance changes:Source: official TF2 Blog
Players being healed by a medic are immune to movement-impairing effects generated by hit-scan weapons.