So let's begin with what we know. In Destiny 1's grimore that helps set the stage for Destiny 2 we know that fallen across the Cosmodrome and beyond are retreating and are going into hiding. Prince Uldren, the Queens brother, was captured by the House of Kings (on purpose?) and as far as I could tell killed their Kell and took over. The Kings also appeared to be not as powerful as we expected. Then in Destiny 2 as far as we've seen we don't see the Devils, Kings or any past Houses of Fallen, only the new Purple colored House. We do see some old banners of the past factions as shown in some recent gameplay of the EDZ though. So now that we have what we know down here's my theory and guess as to what's going on. Uldren, now the Kell to the Kings who are the Fallen House that is in charge of the Devils; called a massive retreat of all fallen in the Cosmodrome (Possibly beyond? I don't remember if it was in the grimore). Uldren is pulling a House of Wolves kind of move, creating one big super House. I'm guessing it will be called the House of Queens (Hence the purple color), or House of Crows. Prince Uldren already hated us before the events of TTK. We saw the disappointment in his face as he was fighting Oryx's fleet, telling there was little to no hope and wathching his Awoken sisters die. Just like we brought the Fallen to their knees, our actions caused the Awoken to fall to theirs, and most aren't happy with us. Uldren and the Fallen have a common enemy, us. He probably saw the opportunity at attacking us with his new Fallen House after getting word of the Cabal invasion. Then after we deal with the Cabal we go after the new Fallen, track down their Kell and when we think we are going to confront a large Fallen Captain we find Uldren, an Awoken with nothing left to loose but his life. Now that would be a pretty cool raid encounter imo. That's my thoughts about the new Fallen House. What do you guys think about the new Fallen House?