For Honor OPEN beta, Feb 9 - 12
If you want to try FOR HONOR before retail release, you get one more chance.
Ubisoft will be hosting an open beta (more likely it's a stress test) from Thursday, February 9th to Sunday the 12th.
To my surprise, Vikings won the war of the closed beta. Also surprising to me was the fact that no matter which faction you choose, you can use any character -- each faction has 3, and you start with 1 from each. I was able to get a new character after a single match.
The game modes are 4v4, 2v2 and 1v1. Note that you can play ANY of the modes cooperatively against AI instead of other people, which is good for training or casual.