This interview actually gave a lot more information than at first glance. It's confirmed or narrowed down a lot of things. They say 3 players is around the size of the typical co-op mission type thing. Public events vary, but 7 is kind of what we can expect, give or take from that a handful of players. Multi-player is what you would expect from multi-player, and social spaces probably have a chunk more than that. But in play spaces, it won't be massive amounts of players.