Each manufacturer will have their own visual styling/theme. The purpose of this is to be able to easily identify a weapon's manufacturer and quality by simple looking at it. No manufacturers will have the same looking gun
NPC's will be fully animated and move around their locations, interacting with objects within their locations
Gearbox wants to make 4 seating standard on each vehicle
Class mods and Artifacts will be returning
BL2's skill tree will maintain the 3 Branch system and have more defined abilities rather than simple stat boosts. It is unknown how many skills will occupy each branch.
2 Gunzerker Skills were mentioned. One, increases the fire rate of any weapon the longer the trigger is held down. A second, while Dual-wielding, increases accuracy with same class weapons, or doubles damage for different class weapons.