When I first saw it, I didn't think they would actually take the Shangri-La quests of Far Cry 4 (Optional Quests) and expand on them. Robo-Animal hybrids are kinda meh in this day and age (I had my fill with Beast Wars) but it can definitely work. The only problem I see is how repetitive it might get...and I hate to use that word, because no one uses it correctly, and or in the proper context...
To clarify, repetitive in the sense that unlike Shadow of the Colossus where they head huge monsters in between your respite, FCP will include a myriad of "all sorts" and will make fighting beasts a bit cliche in its own game. The problem with Ubisoft in general, is that they like inundating the player with everything all at once and with a quick pace. It might seem a bit "too much" out the gate.