Battleborn has been making some waves, mostly due to its pedigree—after all, it's being made by Gearbox, the same people that brought us the Borderlands franchise. They recently posted a 23-minute gameplay video, originally shown at E3:
Battleborn appears to be a mix of Borderlands and MOBAs. It's a first-person shooter where you control one of 25 available characters with wildly differing abilities. Characters progress through levels 1 to 10 in every mission, and they'll also climb a permanent rank system, which will unlock new abilities. Battleborn characters should fit into the usual attack, defense, and support archetypes common in MOBAs.
Gearbox's creative director explained a little more of the game's philosophy in a forum post, stating that Battleborn takes elements from games as varied as Team Fortress 2 and World of Warcraft.
Multiplayer games should play out as 5-vs-5 matches, with a variety of gameplay modes available. Antisocial types like me will be happy to know that Battleborn features a full-fledged story mode that can be played either solo or cooperatively, as well.