A fair while after its original announcement months ago, Square Enix released the first actual trailer for Heroes of Ruin today. You can watch it above, courtesy of CVG.
To encourage you to play with other players online, Heroes of Ruin has a friendship leveling system. The game keeps track of which other players you play with frequently, and builds up your friendship metre with them, the more you play together. A higher level of friendship means more perks while playing with them.