Valve recently confirmed rumors of them working on a new game in the Half Life series called Half-Life: Alyx. This game is set to take place after Half-Life 2 and will be officially revealed this Thursday.
It was also revealed to be a VR-based game for the Valve Index VR headset and currently rumored to have a March 2020 release date.
https://www.pcgamer.com/rumour-valve...half-life-alyx