[quote=Honored Brother]
Could players be expected to play factions which may not be considered nations at all or do not operate in the sense a nation or soviergn state would?Like say Necrons still under C'tan influence or the Tyranids?Also the Orks don't have much on their agenda rather than "beet up em' humies fun".
[/quote]

Yes, tyranids are broken from the hivemind so each synapse creature is now pretty much autonomous, think of the tyranid synapse system akin to the ork waaagh. The number of synapse creatures or at least creatures able to survive autonomously will also greatly increase since the hivemind is no longer able to just replace gaunts and the like as easily.

Necrons are fine, necrons under the control of a C'tan as well though the C'tan would be at the barest fraction of it's power of course.

Orks are completely fine as well, they have their own government system after all, the biggest and the greenest is in charge,