So far i've noticed many new changes to how the game is played, some good and some not as good.

-Story immeidately jumps into the action

-Health meter, unlike the first game

-Jackie can sprint (a known complaint)

-No more stockpiling of weapons: In the original game, there were many guns that we just didn't use. Now instead of carrying around all of those weapons, we have limits

-I have a new found respect for Aunt Sarah

-Dual wielding is a little bit more difficult than when using a controller

-Boss fights, something i've been hoping for

-Huge story, more than likely way bigger than the original's

-Upgradable darkness powers

-Multiple types of execution instead of weapon specific variations

-Enemy must be stunned before they can be executed: a dislike

-Throwable objects

There's many more examples but im only showing a few.