Well, this is exciting. Stoic today released the first gameplay video to their upcoming viking strategy RPG, The Banner Saga. The video acts as a crash course on the combat system.
In Banner Saga, fights are split between Battles and War. The former is a small-scale fight that only affects your party of six. The latter occurs when your caravan runs into opposition, which will then present you with a summary of the situation and options. Then, you pick your heroes, taking into account team composition and stats. Some hero combos obviously work better than others.
Your units can be downed in battle, at which point you have to rest them for a few days before they're available again. At least they don't perma-die, like in Final Fantasy Tactics or something.
The video goes into more detail. Check it out.
Banner Saga's very first trailer was released in early November. Currently, the game is expected to launch in January 2014.