Ooh, I'm excited for mass. I agree, mass will really be the element to give the animals' movement a natural, smooth feel.
Do each of the animals' goals have a priority level, where they're weighed against the others depending on the animal's current situation? For instance, if a wolf were to put itself in between an elk and the rest of its herd, the elk has two conflicting goals: Stay with the herd, and get away from the wolf.
On the "Follow the leaders" logic, was a sort of 'if-then' statement used, where if the elk found themselves at the front, with no elk in front of them, then they'd keep going forwards instead of trying to double backwards (In essence, Rule #2 no longer applies to them as it does for those behind them)?
Depending on the speed and momentum of the elk, will wolves actually be able to be 'trampled', where the wolf is knocked down and injured if it's run over by the elk?
I also recently watched a short clip on YouTube of a wolf hunting caribou by itself: and this sparked some thought. In the current game, taking down an elk means just biting it continuously until its health is gone. Are more realistic means of bringing down big game going to be implemented, where a player wolf would need to grab the animal to slow it down, before biting the throat and suffocating it to kill it, as shown at 2:06 in the video?