Now, you might instantly think this is stupid, but as Mark Twain said: "The only stupid questions, are those that are never asked."

Anyway...

Will there be missions that you will, i dont know, team up or form groups to do certain things?  Like there being a mission (too WOW-ish?) where you need to beat a whole bunch of people, but you need a team?  Thats just an example.

Also, is it possible that there could be a four -way battle? 

They have to be asked, and im sorry if they were already. >_>