Half-Life Alyx is a highly anticipated Virtual Reality title that will take place before the events of "Half Life 2".
In the game players will control Alyx Vance as she and her father Eli do battle with the aliens known as "The Combine". To make use of the system you'll be using the in game "Gravity Gloves" to interact with puzzles and defeat enemies.
Valve said of the game play "Lean to aim around a broken wall and under a Barnacle to make an impossible shot. Rummage through shelves to find a healing syringe and some shotgun shells. Manipulate tools to hack alien interfaces. Toss a bottle through a window to distract an enemy. Rip a Headcrab off your face and throw it at a Combine soldier"
The game is being developed on the Source 2 engine and is fairly unique in that it will support pretty much all of the PC Compatible VR Headsets on top of that there is no plan for a non-VR version so it is likely that this will be a completely VR exclusive title.
That list of VR Compatible headsets includes the "Valve Index", "HTX Vive", "Oculus Rift & Quest" and Windows Mixed Reality.
Most VR games are known to be short and sweet, like little "tech Demos" rather than fully fleshed titles. This one in comparison will be an epic masterpiece. The game time is said to be around the same as Half-Life 2 and while it's set between the 2 main titles it is considered to be a full story and not just a "side-quest"
The game is due for release on March 3rd 2020. It's recommended that you play the original 2 games before this comes out and Valve has made them free to play on Steam until Alyx becomes available.