Or dynamic grouping. Basically, I would love to see it happen where, if I see someone fighting a mob I can run up along side them and help them kill it, without hindering them and while gaining some benefit as well. I enjoy doing this on my own but I would like to see it happen in some kind of official way.

The main reason I bring it up is because the opening cinematic shows this kind of grouping. The adventurer finds himself in the middle of a party battling and simply joins in by fighting as well. This kind of gameplay is fun and I believe would bolster an already great community.