It sounds like several new things, but I'm assuming most of them are on a "Here's new Battleborn DLC" scale.
Source: http://east.paxsite.com/schedule/panel/inside-gearbox-panel1PAX said:Inside Gearbox Panel
This is your opportunity to get a behind-the-scenes look at Gearbox Software and Gearbox Publishing, along with the latest news and updates from the makers of Borderlands, Battleborn, Brothers in Arms, and more! We will have never-before-seen reveals, exclusives, and surprises, so dont miss out!