"At launch, up to eight people will be able to join a Party Chat at a time on Xbox One," a Microsoft spokesperson told the site. FYI, this is the same number of people the Xbox 360 will support chatting at any one time.
I'm curious to see what happens after launch. Note the Microsoft rep stated that "At launch" it will support 8 people at once. Thoughts? It sounds like they might have plans to change this down the road??
Source: IGN