GungHo Online CEO Kazuki Morishita recently confirmed to Destructoid that Let it Die would be receiving a "huge update" at the end of June.
"The 40 floors up to now were a practice stage," Morishita said. "Now this is where the real game starts. [The new floors] will be quite different."
According to Morishita, if the launch version of the game was a roguelike, the new floors will be more like the original Rogue. There won't be any elevators in the new floors, forcing players to start again from the beginning each time they die. The new content will be more challenging than the current Let it Die floors, but Morishita said the developers didn't want the additional floors to feel like a "hard mode."