I'm literally in the door from a talk/book signing given by Graham McNeill. He gave out some juicy tidbits in the Q and A session.

the first question asked was how many more books were there going to be in the Horus Heresy Series, he said that we were only at the beginning, that we knew a lot about the start and the end of the heresy, but not a lot about the middle, and that this was where they were concentrating next- it was going to surprise a lot of people and the reason we don't know anything about it will become clear. He gave a polished answer so its clear that he's been asked this many times before.

He also said that his next book would be set on Terra, it would be a thriller amoungst the astropaths and would be similar to a theme already touched upon- devided loyalties in members of traitor legions who had spent the last few decades with Loyalist legions and who had conflicted loyalties.

he said tthere will not be a book about every legion, but every legion will be mentioned in a book. he speciefied that the iron hands had been covered by Fulgrim and there wasn't much more to do with them.

He also said that he was a bit tired of traitors who rebelled for conflicted reasons and were loyalk at heart- a la thousand sons and alpha legion, he wanted to do one about legions who did bad things for the pleasure of doing bad things. Someone shouted out night lords and he said that "Aaron" would be doing the book on them, he wanted to do one on the Iron Legion and they covered teh Doing bad things for fun aspect perfectly.

He also mentioned that the Space Wolves would not be like "Bill's space wolves" they wouldn't be Drinking, singing farting spacewolves- they'd be a lot more feral.

Hementioned that the Emporer had foreseen 40k and wanted to avoid the whole carrion lord on a golden throne scenario but that Magnus had accidentally put a hole in this.

He Draws inspiration from Joss Whedons directors commentary and Honsou gets some of this inspiration- specifically his yeah whatever attitude to other Chaos Warlords more pontificating speeches.

I over heard him mention he had difficulty writing mechanicum when signing someone elses books..

Whilst I was getting My book signed I asked how he pronounced Lasgun- Lasgun or Layz-gun. He seemed surprised that anyone would ever pro nounce it Layz gun and said that americans misprounounce many parts of the 40k Universe- examples he gave were SEE-tan and xenich.