Board Thread:Warhammer 40k General Discussion/@comment-96.237.238.119-20131218020230/@comment-24383134-20140106071037

While this is all speculation on what we the posters believe will happen in M42, most of your raised points I am aware of, but my original post is just what I think will happen.

The Tau were marked to be cleansed during M35, but Warp Storms forced the Imperium to postpone their plans in that section of the Galaxy. In the 6,000 years they were isolated, the Tau developed technology that is on par in most areas, and in some areas far superior to the technology used by the Imperium. If Imperial space shrinks, that means there would be less Imperial forces to impede a Tau advance.

While the Eldar do indeed regard humanity with derision as a weak-willed race, the Eldar are obsessed with preserving and, (if possible) restoring their former way of life. The threat of the Necron scourge is a galactic threat, perhaps even more dangerous then the Tyranids, and if not, they are very close in power. The Eldar would form an alliance with the Mon'Keigh if it meant the annihilation of their species otherwise.

I am unfamiliar with The Unremembered Empire, as my own experience with The Horus Heresy novels ends at Descent of Angels currently.