Agreed brotha, still if you wanna play any Wh40k game on Steam, I'm there and some of the guys from the Forum too. For now, let us continue with our support for the after release Chaos Space Marines.
So much Thousand Sons and Alpha Legion on this thread oO I'll vote Death Guard and Emperor's Children.
Death Guard. So far the four chaos factions at launch is chaos undivided and two of those factions could arguably be said to not really be followers of chaos at all. Warhammer: Age of Reckoning used Tzeentch as the primary god for its chaos faction, its time for Nurgle to get some much deserved love.
As much as I love the Thousand Sons and enjoy the other Legions devoted to a specific ruinous power, I'll vote Alpha Legion for this one. Why? I think if we sit back and wait for these specific legions they will turn out much more original and diverse than starting with one of them right away. It would give the developers more time to think about what makes them unique, whereas the undivided legions have their own way of making the most out of it since they start right of the beginning.
For Malice to appear in the Material realm a trial has to be completed eleven times and it has been completed ten times so hence he is easier to bring in to the material realm I think I found this on Lexicanum
Unfortunately, the fifth Chaos God (Malal/Malice) will probably never get his time in the 40K universe. GW doesn't own the rights to use him - he was an independent IP by a comic creator hired to do a little set piece way back when. The Sons of Malice were a nod to him, but they can't actually use him. That's not to say that they can't include a fifth god at all, but at this point, they've built the storyline around the four that they own the rights to, and so it's unlikely they would go and throw a whole new angle in like that.