Do we know if the article specifically said that the Companions = Fighters? Or was that an assumption?
Yes, for warriors, also confirmed separately by vsions who said that the group is called "The Companions"
Perhaps some influence from the "Brave Companions" gang of thugs from Game of Thrones, or maybe they will be more along the lines of http://en.wikipedia.org/wiki/Companion_cavalry
When I hear "The Companions" I think there might be some interesting and cool new quests and back history.
when I hear "The Fighter's Guild" I think generic employment office that asks me to fetch 20 wolf pelts