It's not completely unbelievable that early in the development process the idea was to use the same location as FC4 but of course in the past - but then maybe further along in development the decision was made (most likely to closer match history) to shift the game's location to "central Europe somewhere." It may have been too late at that point to get a new map in there, but then again who knows.
6 hours into it and I still haven't had a "Hey! This is Far Cry 4!" moment.
I'm on the fence whether it's overall enough "new" stuff to warrant full price (gut feeling is "no") and Ubi doesn't let its developers talk all that much so... never know if we'll get a legit answer, nor do we ever get the feeling that anyone cares about the customers.
Definitely don't pay full price for it. Watch GMG and other outlets like that and make a move when it feels right to you. I still see 25 percent off at GMG immediately marked off without even using a coupon code. That takes it down to $45. I won't be surprised if other coupons and VIP sales take place in the near future. Keep an eye on it.