Okay, there seems to be a bit of a confusion going on here, time to clarify a bit:
There was another game that was supposed to be set entirely in the brotherhood. This happened, if I remember correctly, due to one of the Expanded Crew members splitting off the project and taking matters into his own hands and just saying "Fuck it, I'll make my own game". Pretty commendable in its own right to just go and make your own project if you feel like what you've been working on isn't getting you anywhere at least - That project had however no affiliation with the Expanded Crew. In fact, on F95 it's been abandoned since then.
The 2 projects the Expanded Crew currently has are basically the following:
The entire rewrite of the Expanded Mod - A Code-based rewrite in order to make the game not just run smoothly and a lot more stable, but to allow easy porting of new content that comes from the base game onto the mod - sounds backwards when you think about it at first. But due to Onis code being a noodly mess (which still holds partially true in the most recent public version) this task has eaten away at a lot of time, but it seems to be just more feasible to do, because the other option would be the following for each and every new update that Oni brings out...
Which is porting the existing mod onto the newest public version and make sure it actually boots up without just crashing outright, with all the hassles that brings to it. This is basically the 2nd project that the Expanded Crew works on, written by Tinymanhood. Tinymanhood as of right now is basically doing this ungrateful job of porting the mod so people can enjoy it in the newest version of the game. However, due to it being basically a 1 man effort it is still a colossal undertaking.