Vehicles have gone up in price, combat viability is a lie, you're better off bringing a Farseer or Warlock as your HQ than one of our own inferior commanders (which you can do in the same detachment) our Razorwing Jetfighter is awesome as is the Ravager, we are a surprisingly slow army for GW's description of 'blisteringly fast'.
Charge your opponents snooty units with your vehicles if required.
Aim for 1 Darklance per 100 points worth of army.
Stick out of LOS and gunline.
Bring small units of beasts or Kabs to screen against deepstriking enemies or psychic powers as this is your only form of defence against such attacks.
Scourges are our only form of Deepstrike and they are awesome. Remember to pack Darklance on your Scourges and only ever advance them if you're racing for a point to win the game.
Otherwise, business as usual with our gun-boats.
Don't touch the cult units, they suck.
This world exists because of the things we have done, forever branching to the decisions we make and twisting to what we do not.
”Woe to our enemies. We'll tear them apart regardless.” ~Barrywise