Half-Life 3 has not been confirmed yet by Valve but this long awaited game is being rumored a lot.
This will be the sequel to the well accepted Half-Life 2. The entire Half-Life franchise is developed by Valve. As expected, the game will remain in the FPS genre only.
We expect a lot of new elements and gameplay improvements in the title. The game is yet to be confirmed, so do check back for more information.