I'd also like to see the Imperial Fists in there, but I doubt they will be included, regarding the BT already being in and such...
But hey, this is a game, so the rules are not set in stone. It could be pretty challenging to include more/other chapters or even invent your own. Perhaps there will even be rules for this...
Already been stated that there won't be rules to make your own chapters, at least not in the core book. That said, I don't see how it's going to be hard to make up your own chapter rules without a system for it.
~Yea, Tho I Walk Through The Valley Of The Shadow Of Death, I Shall Fear No Evil~
Rogue Trader, Dark Heresy, Deathwatch, Black Crusade + Only War Playtester
Star Wars: Edge of the Empire Playtester
I do not speak in any official capacity for FFG, all my posts are my own opinion, speculation, etc.
One of Three Founders of Dark Reign