So, this game is looking to be massive and it seems to have a ton of possible paths. Today I sat and thought about how each combination may play out. The teaser shows that some endings can't be combined if they don't make sense, which helps things out. Here are my predictions:
GSPI + GI = Government sends Charles and Henry to stop the Clan. The Wall is involved; they may not have seen you escape but Ellie ratted you out.
GSPI + CA = Government sends Charles, Henry and Ellie on the mission. The Wall is involved, they are looking for Ellie and Henry.
GSPI + PD = You go with Charles, The Wall is not involved, they think he's dead.
GSPI + IRO = After Charles rescues you, you go with him straight to the Toppat base to help him take down the Toppats (Remember how he said "he was on a mission" when you called him in IRO? This was it). Wall is involved and is after Charles.
GSPI + TB = Not possible. The Airship couldn't possibly help Henry since you arrested all its members before.
The Toppat Clan seen in ITA is not present as they've all been arrested, only the Secret Base members are left.
PBT + GI = Henry is after the clan on his own for some reason. The Wall is involved. The Government is against Henry but not currently after him.
PBT + CA = Henry and Ellie go after the clan. The Wall is involved. Government is against Henry but not after him and doesn't care about Ellie.
PBT + PD = Henry goes after the Clan alone. The Wall is not involved. Government is neutral and might believe you are dead as well.
PBT + IRO = Not possible. Charles had no reason to rescue Henry since he didn't obey the government before.
PBT + TB = Not possible. No airship could've helped him escape.
The Toppat Leaders are all involved in the above paths, but not the Airship.
RBH + GI = Government sends Henry again to go after the clan. The Wall is involved, Ellie ratted him out.
RBH + CA = Government sends Ellie and Henry after the clan. The Wall is involved. Most likely to be the path shown in the teaser with Ellie and Henry.
RBH + PD = Government sends Henry again to go after the clan. The Wall is not involved as they think he's dead.
RBH + IRO = Similar to GSPI + IRO, but with the Airship involved.
RBH + TB = Not Possible. Toppat leader was arrested before FtC.
The Toppat Leaders are not involved in this one, but the Airship is.
RPE + GI = After fleeing from the complex, Henry returns to the Secret Base, only to find out the Government is after it, and that The Wall found out he escaped. Now he has to deal with both somehow.
RPE + CA = Similar to the above, with Ellie helping Henry.
RPE + PD = The Wall is not involved since they think Henry is dead, so it's just the Government.
RPE + IRO = Not possible. Charles wouldn't have helped Henry since he betrayed the Government.
RPE + TB = Henry's dead, who knows who you'll be playing as. This may be the most important and detailed path.
Darkaris13
@PBSfanboy The Spoilers thing is meant to be a joke.