According to Tyler McVicker, the creator and host of the YouTube channel Valve News Network, Valve has another VR project in the works. The codename for the project is Citadel and according to McVicker, it uses asymmetrical PC vs. VR gameplay.
Valve News Network deals in a lot of rumours, usually attempting to decipher the differences between actual facts and simple speculation. Their history with Valve rumours does lend an air of credibility to their statements, they have datamined info from various Valve game tools and updates and some of their claims about Half Life: Alyx were 100% correct. The news network correctly predicted the time-period the game was set in, the fact that Alyx was the player-character, and the inclusion of the Gravity Gloves.
Now, McVicker believes that the new game to come out of Valve will be a multiplayer game with asymmetric gameplay between PC and VR. The game, McVicker believes, will see one side be presented with a top-down view of the map with the ability to spawn enemies and the other side will be down on the map itself fighting off the enemies. It is not clear which side will be in VR.
While the codename, Citadel, may be a nod to the Half Life franchise, there is currently no IP attached to the game. Their most recent VR title did not have a level set in the Citadel. In the recently released BTS book, The Final Hours of Half-Life: Alyx, the end of the book teases the company’s future in VR:
“Others wonder if more VR games might be in the future, as Valve continues to push further into the VR hardware space. Maybe there will be surprises as well, including a top-secret new project that another small team at Valve has been working on since the first part of 2018.”