So Witcher 3 had over 250 in-house devs and to this date only around 100 still are at CDPR working on Witcher 4.
The company developed The Witcher 3: Wild Hunt with a self-funded budget of US$81 million over three-and-a-half years. The project began with 150 employees, eventually growing to over 250 in-house staff. 1,500 people were involved in the production globally.
That's a significant portion of the 200+ devs on the 2015 RPG
www.gamesradar.com
I was worried about the talent loss. But based on the quality of Phantom Liberty and this quest, I am hopeful that the new talents in W4 team can deliver great stuff!