The technique system is going to be a new and improved way for battles to happen. In order to learn techniques you must have won or lost a certain amount of battles. Winning of course will provide better better techniques.
The catch is that a battle requires a member to die. Thankfully being revived is not too difficult so I expect members to die much more frequently. On your profile it says battles won and battles lost. You lose a battle when you die. You win one when you kill someone. When you win a battle you are awarded 2 battle points, which is as well in you profile and you should be updating it whenever you kill someone.
You must spend battle points to earn techniques. If it is a larger battle where it is 2v1 or 3v1 etc... All members included that kill the 1 person gains 2 battle points. On the other hand if the 1 person kills all of the others they gain 2 for each person killed. If you kill 2 people then die you gain 5 battle points. Which brings me to dying. When you die you will receive 1 battle point. So even if you lose you still have an opportunity to have a new technique. There will be many techniques to buy so make sure to check it out.