New edition, new rules

Warhammer 40.000 has now come out with the new rules (6th edition I believe) and the rulebook is massive. Hopefully there aren't too many changes in what is allowed for regular armament as I would hate to have units that is no longer allowed in the game before I even get a game in with them.
What I know is a new (or rather a returned rule I believe) is the rule about the allies. You are now allowed to take an army and add allied forces to it given that these allied forces uses a different codex. For me, this means that the Sisters of Battle might enter the battlefield alongside the Space Marines, or I will be able to field an army combining Space Marines and Imperial Guard in regular games and not just in Apocalypse.

I have decided to use the same basing material for all my 40K troops more or less, I will make some small variations, but the basic feel will be identical to make it believable that they all serve on the same planet when using them together. This also saves money, as I don't need to buy yet another basing material. 
The basic feel is black, crumbled rocks or ashes, with some grey rocks for the bases of Dreadnoughts and some patches of grass or different kinds of mossy vegetetion on some of them.

For the Warhammer Fantasy armies there will be more variation for the different armies. Mostly different kinds of grass and rock, separate or in combination. Might also be some water effects or cornfields or other kind of terrain. I will see what I do when I work with each individual army.