There's a certain aspect of the Warp that has been mostly ignored or played up as a joke for a long time. There is no time there. There's little tidbits about how sometimes ships leave the Warp before they even enter it or how ships get lost for a thousand years and to them its been a day. There are just incredibly huge implications there that as a GM I plan on exploring. Just looking for "average player" feedback here on how this impact the game.
Everything happens within the Warp simultaneously. There is no past, present or future. It is Chaos and is unbound by the restrictions of the real world. This is how the mortal races like the Eldar are able to predict the future. While it has not happened in the Materium yet, all things from all times are reflected in the Immaterium. This idea makes a few official pieces of fluff inconsistent however. Like that little excerpt from the old Necrons codex about how in the beginning the Warp was a calmer place. If the Warp is timeless than there is no beginning nor end. Any concept of linearity must be thrown out the window.
Than there's the whole bit about the births of Gods. Like Slannesh. If the Warp is timeless, than all Gods that will come into existence already exist within the Warp. This puts the birth of Slannesh into a new light doesn't it? If Slannesh already existed on one dimension than how could it have been born then? Why weren't there any cults of Slannesh before then? Why don't any of the Gods that yet to exist in the Materium have cults? Gods do not like other gods remember? For a God to come into existence it has to survive the predations of all the other gods. That involves manipulating the events in the real world that would result in that God's birth while the other Gods try to destroy it. It is a very careful affair. If a God is born but it fails to defend its own birth, than it is never born at all. If the Warp is a reflection of all that has and will happen, than those gods who never could orchestrate their own births never existed at all to be able to defend itself. The Gods struggle for dominance rages through echos of things that are and things that could be yet never will.
How does this affect the players at all? Well, I fully intend on showing the pantheon of Chaos as being as convoluted as that previous description would imply. Devotees of never-born gods whom still receive powers and gifts from that echo of a being that could have been but never was. Or the pawns of Gods that are and yet are still yet to be born. Or the disciples of Nurgle whom worship different Nurgles. All possible entities that are or could have been that create a combined entity that is what the full Chaos god is. Then there is the smaller sphere of influence of Daemons and their minions. Keep in mind that I do not consider a Chaos God to be merely a big Daemon. They are different and distinct entities. However, a Daemon does derive sustenance from the souls and worship of mortals and thus they compete for the same resources. Also, a Daemon, just like an idea or an emotion, can form the seed that would give rise to a Chaos God.
So how about it gentlemen? Would you enjoy this? Seems like everything I read about Chaos is all about either one of the Big Four or their mortal servants in the Legions. This just seems entirely wrong to me seeing as its supposed to be Chaos. I want to create a truly labyrinthine organization for Chaos to better reflect its nature.