I think the gameplay and combat opportunities will be really cool in the game, but it won't feel like traditional Source/Half-Life combat. It's gonna take advantage of all of the stuff you can do in VR. Just imagine stuff like ripping a headcrab off your head to throw it at a combine soldier. Opening a door slightly with your left hand to throw a grenade into a room of combine soldiers with your right and then slamming the door shut with your left fluidly. Imagine throwing a glass bottle into a room of combine soldiers from above to distract them, then using the gravity gloves to steal a grenade from one of them then chucking it right at them. Crouching down to sneak a shot through a little crack in a wall. Lots of cool opportunities, and there's probably a ton more that I haven't thought of. Not to mention the puzzle solving, hacking combine tech, and world exploration and storytelling. This isn't gonna be a gimmicky tech demo where you stand in a room shooting enemies for an hour and a half. This is a full 15+ hour long AAA Half-Life game.
I'm really happy they're not excluding anyone when it comes to VR, too. The game supports the Valve Index, Vive, Oculus Rift S, Oculus Quest (using the link to PC cable), and Windows Mixed Reality. You can play it seated, standing, or with full roomscale. You can teleport, shift (move from A to B smoothly), or move smoothly using the analog stick. They've got everything covered.