I'm really looking forward to seeing what they do with the c'tan. I find it interesting that in all the Shield of Baal stuff they are referred to as c'tan and no longer c'tan shards? Maybe there is no transcendent c'tan anymore and c'tan are just being buffed back to how they used to be (though probably more balanced). I mean the models are awesome, just no one will ever use them cus they are bullet magnets.
I expect the extra pages are more likely to be fleshing out the individual dynasties' fluffs. The old codex mainly focussed on necrons as a whole or the Sautekh dynasty, apart from one page of the different dynasties. It woud be interesting to see what makes the others different apart from the way they look.
Me: To be honest im amazed there isn't a chaos god of not revising or at least chaos god of procrastination
MidnightSun: There will be, when enough people do it. Y'know when the Eldar were all engaging in their hedonism and Slaanesh ripped open the Eye of Terror with his creation? Slaanesh will have NOTHING on the God of Procrastination, and his vile minions will carve the galaxy asunder in a thousand year reign of blood.... Tomorrow