I would say that it is not the same as in the third game and not the same as in the fourth.
But still, it seems to me that it is more similar to the third game, only more complex.
HOW? Well, it's not like the third game's skill tree, which was like this:
Basic... > Advanced... and so on.
And in the fourth game, it was like this:
Tactics - Attack - Defense - Leadership.
In the fifth game, the skill progression is very similar to the fourth!
