Half-Life: Alyx is "the largest single" development team Valve has ever had. During a Reddit AMA that took place last night, a studio representative told fans that more were currently working on the game than any previous Valve project.
When asked how many people were working on the upcoming VR game, the developer replied that "right now it's around 80 people, which puts it as the largest single team we've ever had at Valve." That's bigger than even the company's ongoing projects, like Dota 2 and CS:GO, both of which require regular attention.
Elsewhere in the AMA, Valve said that the game was complete, and that it was "confident" it wouldn't be delayed. With a team this large, you'd hope that would be the case, but it sounds as though plenty has been happening behind the scenes - one developer said that "we let the Valve Time happen before we announced the game."
The sheer size of the Half-Life: Alyx team has been felt elsewhere, as other teams have been brought in to help finish the game. The impact of those moves have been felt across the company, as games ranging from Team Fortress to In the Valley of the Gods have been put on hold to expedite the creation of the new Half-Life game.