1- Not sure what way you mean. It is an isometric turn based RPG with action points, it has a focus on dialogue, story, and progression. It doesn't have physics objects that you can move around like I remember in Divinity, but they aren't that dissimilar. Not much in the way of ground objects you can light on fire or interact with, though there are molotovs and environmental things you can shoot to inflict status effects sometimes.
2- I'm not that far in, but the writing is quite good so far and the lineage the game comes from has decent stories that are very similar. I would say these games don't necessarily try and tell a story with complicated plot, they are more about individuals and your attempts to save them or remove the people in power that rule with an iron fist or through corruption. That said combat is a big part of the game but it isn't the focus.
3- Progression is the name of the game in these games. Your hit chance is heavily determined by stats and skills that you improve through leveling, your access to side areas and ideal solutions rely almost entirely on your skills. In past games weapons and armor were huge upgrades not only because of increased damage but because of the way armor works. Armor rating and enemy armor are basically the number 1 progression gate historially, you do no damage to highly armored enemies and they deal incredibly high damage to you if you do not have appropriate armor. In my experience the progression loop is very involved and rewarding and you will definitely notice levels and equipment upgrades.