No, I don't think Feral Heart will die out once Arokai comes out. Maybe for the first few days of Arokai's release people of FH/IT will go and try it out to see if they like it or not. (Maybe less people on servers for a couple days.) Depending on their opinion of the game they will either remain members of FH, members of both games, or just Arokai by itself. That's what I'm thinking might happen. o3o
I think pretty much this. Honestly, it looks really similar to me. Again, trolling will probably make the biggest difference. In all other ways, it looks extremely similar to FH and IT (or what I have heard of IT). Maps are also going to be an important factor, and from the previews I have seen, AK's maps don't look that impressive compared to FH. Finally, if and how they manage combat would be a big factor for me. I personally prefer an objective, tabletop-like system. FH is primarily Freeform, which is not really something I am comfortable with. On the other hand, if a majority of players on AK end up playing it primarily for the fighting, I would probably leave it. Just have to wait and see what it is like, and I expect it will be much like FH.
As for myself, I will probably play a little bit on both until/unless one or the other proves to be particularly inviting. Also, I am personally glad to see more options showing up. Up until now, it felt like if you want an online wolf game, it is pretty much IT (which I haven't even found the private servers and not sure I want to), WolfQuest (which is really underwhelming me right now), and FH, which seems decent.