The original Binding of Isaac received a sizable expansion named The Wrath of the Lamb, which freshened up many of the game’s components and took you even deeper into the dungeon. Rebirth improved on this even more, with a host of new items, though it appears as though they’re not quite done yet. In fact, they’re planning to double the amount you can do with a new game mode. Edmund McMillen wrote on his blog:
Once the holidays end, the Nicalis gang will be jumping back into the abyss and digging into the very large design doc I have ready for em. I have big plans for this expansion, I hope to add a very huge chunk of gameplay in the form of a new game mode that will almost double the amount of things you can do, I’m very proud of this new design.
Aside from this new game mode the expansion will feature a ton more enemies, bosses, new areas, endings and a new playable character as well as a slew of new unique items to play with…
Best of all, the developers want to hear from you about what you’d like to see in terms of items. There’s currently a thread on Reddit where you can post your ideas, and the top ten will be implemented into the game. So, get your thinking caps on and perhaps you’ll see your item in the expansion!
Source: Isaac Blog