Actually, the previous games were meant to be Turn-Based, but they became Real-Time because of pressure from publishers.
For the videos shown, take into consideration they were demonstrating the combat and it would've at least doubled the time required for actually finishing the battle.
Plus, turn based games can be great fun if implemented right. Take the King's Bounty games, for example. The combat is deceptively simple to begin with, but can become extremely fun ans challenging later on.
