This is worth a watch.
But the summary is that this guy thinks that Valve have been working on a non-VR Half-Life game since they finished making Half-Life Alyx, and that it is probably single player and probably Half-Life 3. But it could just be another game in the series. It is likely being led by Robin Walker, who was involved in the original Half-Life ( and also TF2, TFC, HL2 etc.). It is worth noting that November this year is the 20th anniversary of Half-Life 2, so there is potential that Valve might release something about their upcoming game, or at least hint at it. They could also just shadow drop it next year. I think it's highly likely that we'll know about some sort of Half-Life game before the end of next year.
But the summary is that this guy thinks that Valve have been working on a non-VR Half-Life game since they finished making Half-Life Alyx, and that it is probably single player and probably Half-Life 3. But it could just be another game in the series. It is likely being led by Robin Walker, who was involved in the original Half-Life ( and also TF2, TFC, HL2 etc.). It is worth noting that November this year is the 20th anniversary of Half-Life 2, so there is potential that Valve might release something about their upcoming game, or at least hint at it. They could also just shadow drop it next year. I think it's highly likely that we'll know about some sort of Half-Life game before the end of next year.