Some things i noticed is that the trol beserkers have two inventory slots. In the final fight with the green guy if you kill the four oblesks it weakens the boss so hes easier to kill. And there is a new thing not sure what its called "spirit link" that distributes damage amoung all the players, that appears at the left circle of power sometimes. The castle shows ur inventory whenever you are buying something. The bears have teleport, could be used for something.
If u click on a certin combination of heros in the hero select or some **** like that you can get the hero called unknown ghost (Final Boss) with the best of ablities such as permenate immolation that at max lvl does 600 dammage and other junk like that. if you figure it out exactly can u pm me or post a reply on this.