I would like to express my only concern with Black Crusade, namely its orientation towards warbands.
It is known that GW took a similar course with the last chaos codex, removing many legion-specific rules and introducing a plethora of warbands, and making Huron Blackheart and his Red Corsairs (who are, in all respects, a nice addition to both fluff and wargame. Except that his first name is "Lufgt". W T F?) became the new poster-boys of chaos instead of the Black Legion. A move that estranged many chaos players, who were until then content with their specialised rules, units etc. And now, GW seems to intend to undo this move by releasing a codex devoted to the Chaos Legions.
This is not a random maneuvre on their behalf. The Chaos Legions have proven to be quite popular among the fans. The Thousand Sons novel became a best-seller, and the Horus Heresy series, which builds the background for most of the chaos Legions and their Primarchs, is proving to be very successful. The Word Bearers (my favourite Legion) and Iron Warriors novels got reprinted in collections.
And in the BC corebook, one may read that one of the renegade champions that might be encountered in the Screaming Vortex is "a Word Bearers Dark Apostle". WHAT? In the WB novels, a Dark Apostle is a highest-ranking member who commands a fleet and a Host of over 1000 Astartes. They are perfectly organised, disciplined and devoted, not scattered across the galaxy seeking to make new heretic friends. This also seems to be the case for the Iron Warriors, Black Legion and many others.
To get to the point, I assume that many BC players would wish to play a campaign revolving around a Chaos Legion, its internal power struggle and various undertakings, and the Long War.
The system is currently severely lacking in this aspect. There are no techmarines, apothecaries, dreadnoughts (not necessarily playable, but at least their stats), vehicles, fluff, special weapons, obliterators, posessed marines (like Burias of the WB), and dozens of other stuff.
I am not complaining. BC is an excellent game, and I intend to keep collecting everything that is released. And I am aware that Legions are, by far, not the game's main theme.
They are, however, a huge part of 40k chaos, and have many devoted fans. It is my opinion, that an RPG should cover the broadest possible range of themes, so that it can allow the players and GMs to unleash their creativity in their own way. And seeing that the three next supplements will -most possibly- not focus on Legions, I wanted to voice this concern.
I would eagerly like to hear other players' thoughts on this. Discuss.