Enter the Gungeon developers have recently announced that they are working on a second major content update called Advanced Gungeons & Draguns. The mini-expansion will bring with it a bunch of community requested features, quality of life changes and general improvements, but also hundreds of new and substantially more powerful synergies, a variety of new guns and items, as well as a brand new boss.
The goal behind this update is to make the Gungeon a more generous place, while still preserving the same sort of punishing difficulty. In other words, the enemies will be just as powerful as they ever were, but you will a much greater degree of choice when it comes to viable weapons and tactics. This should hopefully prevent scenarios where you get stuck with an array of nearly worthless weapons against enemies that can easily bring you down.
There is currently no release date set for the Advanced Gungeons & Draguns update, but according to the official announcement you should expect to see it relatively soon. On a slight side note, there will be a small but apparently awesome patch coming in September, though what exactly it will contain the developers didn't specify. I would love to tell you more, but for now I'm afraid all we can do is wait.