I think you misunderstood it. There are historical MP battles with 1vs1, 2vs2, 1vs3 setups. You can still play normal MP battles with whatever setups you want.
Quote Originally Posted by Article
Multiple player setups expanding the scope of these battles beyond the traditional 1v1 scenario to allow for 2v1 and even 3v1 play.
I thought 2vs1 were already possible with regular R:TW. Is this another one of those features that CA forgot about and is now praising it as brand new?