Swen said "4 players + followers" which people took to mean a max party of 4 characters, but he was probably talking about 4 online players max + NPC followers.
As some people have said, there is a screenshot that shows all 5 origins characters in the party, so 4 is clearly not the party size limit.
We really need to know more about the Followers, what they are and what they can do.
