The game is said to take place on Pandora's moon Elpis as well as Hyperion's 'H' shaped base, both of which you can see in Borderlands 2 (Picture after the jump). With PAX East just around the corner, and Gearbox having their own panel there, I expect that we will have an update on this very soon.
"There are two whole new weapon types to get your teeth into this time around. and moons go hand in hand so you won’t be disappointed there, but the real fun looks to be in the class of guns, couple that with the games low gravity setting and it’s a case of set your phasers to fun (sorry) as you freeze and shatter your foes."
It does not, however, mention it's source, simply saying that it 'got info'. I have no reason to distrust what they say but I think I will take it with a pinch of salt. One reason for this being that games change through development... a lot.
|(Hyperion's base outside 'Elpis'. Possible settings for the next game)|
Whether this was leaked by 2K themselves or GamePointsNow broke embargo, thus negating any chance they had of getting info in the future, I am unsure. I will, however keep you all updated on any new info that comes out.