I agree they are an amazing chapter but a few things need to be taken into consideration
1 the other chapters chosen are 1st founding this must be a story arch of some sort
2 the black Templars are not a codex astartes compliant chapter therefore have a different way of working and rules to the 1st founding chapters
3 the black Templars are continuously crusading and It would be hard to have a totally separate story for the pm as they normally go off on their own sometimes even being sent by inquisitors such as those working in the death watch
4 they are a specialty chapter normally focusing on one thing at a time similar to the grey knights minus the secrecy of existence
5 and finally the black Templar are from the original imperial fists that split into soul drinkers, black Templar and crimson fists so the back story is massive for them and could fill a whole game as a single chapter

I got my info from the codex plus novels but if you don't have these go here

http://warhammer40k.wikia.com/wiki/Black_Templars
And here
http://warhammer40k.wikia.com/wiki/Imperial_Fists

So even though they are an amazing chapter I don't think the devs want the game to be black Templar vs the
universe and if it makes you feel any better we orks will go without the blood axes lol traitorous gits talkin and tradin with humies oughta chop em up and fire em outta me grot cannon we shuld

There is also nothing to say they will not get added after launch, with all there correct nuances. Would you like vanilla Templar's at launch, or sooner wait till they can be implemented correctly. Im a huge White scar fan but can see how they would be hard to do in this game. I am more content that they are being left out rather than forced in , in some lore wrecking form which i would hate.

What about the BTs would require more work to implement correctly?

Their structure is different, but how would that be too hard to implement into the game other than roleplaying? Other than having ten neophytes rolling with ten initiates which would be way to many players for such a prominent faction like the Space marines I admit. But at launch scouts aren't going to be ingame so wheres the problem? Their basic look would be the same as the other chapters, power armor with tabards,crosses,chains,candles and lanterns colored black with white or red pauldrons. Can you explain "development" as used at the end?

Are the Blood angels models being made entirely separate from the Ultramarines models instead of just using the same power armor models? They fight much more ferociously the the UMs in the fluff.

I guess and this is me personally the issue for implementation wouldn't be gameplay but probably story not RP but the actual story written by the devs if having the black Templar playable contradicts the story they want to tell then they can't have them as playable we don't even know what time setting they are using yet is it not long after heresy or is the current edition codex.i can see them being an elite character that you can unlock after getting to a certain level but you gotta remember they have weapons given to them by the inquisition they have some of the most valuable artefacts in the universe (some even speculate of salamander origin) and they are allowed to have more than the normal amount of marines in the chapter this makes them a very individual army and one that rarely teams up with other marines this could become hard to explain in pvp

This disappoints me.

If David Ghozland is worried about including Chapters that aren't Codex adherent, he should be sweating about the Space Wolves and Dark Angels (to a much lesser extent) as well. The Black Templar divergence from the Codex Astartes is not a plausible explanation for why they'd be hard to implement at all; in fact, the ways in which the Black Templar's DO diverge from the Codex would lead me to believe it would make the job easier. This is some Alpha level heresy, Behaviour Interactive.

I think the main thing we're worried about is getting a REAL reason as to why they can't be added instead of just speculating about it and letting our beloved chapter slide out of the running for getting into the game.

I have no idea how they would be "too difficult" to implement, each of the 4 starting chapters have a distinct look just as intricate as the Black Templars. Blood Angels have jetpacks that are literally angelic wings like Sanguinius, Space Wolves wear giant wolf pelts across their backs, Ultramarines have their ancient roman style going for them, and Dark Angels have their wing motif plus the robes. Black Templars just fight with chainsword and bolt pistol and wear tabards. Not a difficult implementation on that front.

If it's a matter of codex adherence and tactics, then I'm sorry, because I can't hear you over the sound of the WOLF CAVALRY AND DEEP STRIKING LAND RAIDERS!

1 You know that for a fact that the choices are all 1st founding. Can you give a source on that info please?
2 The Space Wolves don't follow the codex or use its rules about 1st companies in fact they're a whole legion under one roof the biggest sin against the codex of all.
3 Doesn't it make more sense that they would come across this world and jump at the chance to fight three of their enemies at once.
4 Just because BTs honor their forefather Sisgmund by wanting to get into CC doesn't mean they cant use a heavy bolter. oorrrrr does it?
5 What does this have anything to do with them not being in this game?

I understand, it would suck for us ork if they left out the deathskulls or goffs. But I guess in regards to what vigil said maybe that's another reason maybe they see they have 2 chapters that are a little on the rogue side and don't want more i don't know I'm just trying to see wat the devs see as they seem to be 40k miniature painters if not tabletop gamers as seen in the meet the team videos. I guess we will have to wait and see but it could be just that they havnt revealed them yet or that they are sticking with founding chapters

Guys calm down I know this is a sore topic but I'm jus tryin to see things from devs pov and marshal they said on the website under factions what chapters they r using they have said blood angels space wolves ultramarines and dark angels all of these r founding chapters and it doesn't make sense for the black Templars to just ditch what they are doing a crusade is a crusade usually years of fighting one enemy leader or trying to get one relic why would they retreat from a crusade just to help ultramarines? Looks guys its an annoying thing but don't come down hard on someone jus showing perspective