Indeed this is a pretty huge surprise, and I feel like I'm noticing a trend with Microsoft as of late. Remember how before they bought Bethesda, Bethesda was in hot water over stuff like paid mods and Fallout 76? And Activision-Blizzard is in an even worse spot because they outright mistreated employees, and pretty much everyone is calling for Bobby Kotick to finally leave. It almost feels like Microsoft wants to buy out certain infamous companies maybe in hopes of changing them for the better. Starfield is going to be the game that'll show if Bethesda has changed for the better, but for Activision-Blizzard it's possible that the change in leadership is exactly what they need to finally shed the slimy skin of Bobby Kotick and his reign.
From a purely consumer stand point this likely also means IPs like Call of Duty, Warcraft, and others are going to no longer come to PlayStation at some point, being exclusive to Xbox, PC, and maybe getting Nintendo console ports every so often.