Added a link to a preview by beefjack which outlines some new details dropped by the latest issue of Edge. I'll update the OP with new info from the article when I get the chance but enjoy the article for now!
"Gearbox will be looking to improve the sense of differentiation between especially the weapon manufacturers. Dahl, our modern military manufacturer, has guns with camo. Maliwan, our sci-fi outlet, has glowing elemental effects and bold stripes.""
"The Assassin class gains the Predator-like ability Deception, allowing them to confuse opponents as well as deal more damage, but they will have to cleverly balance their use of the ability against its recharge time."
"Each class will also have more interesting and detailed skill trees to progress down, including the introduction of One Point Wonders skills that can really change your available options and gameplay style but only require a small investment to unlock at a basic level. There are at least three different directions that players can tailor each class in now to allow them a wider say in their characters development."
"Environments will be more open, elaborate and dramatic, and missions will be more dynamic in approach, with objectives that can change depending on your actions, and players will have to take these into account when deciding on how they tactically approach combat. "
"Enemies will have different behaviours and interactions with each other, as well as respond to who in the enemy ranks the players are concentrating their focus on and attempt to disrupt those plans."