Last night someone posted up a group of four pics from warseer showing the stat lines of some of the necrons stuff. One thing I noticed is that the doomsday arc seems like a good piece from first blush. 2 - 5 gun arrays on each side, and armor that makes it AV 13 until the first pen. It also has a weapon that changes it's firing stats when it moves is interesting (going from a 24",9,1 Lrg Blast to a 24",7,4, Blast.)
I'm not sold on the cmd barge, mostly because it's kinda bland (tesla cannon, av13 shield, sweep attack which is a movement phase attack, and character wound to repair the barge.)
Finally they show the stat lines of four of the guns and i'm a little sad now. Guass weapons are still Rapid Fire(even the sniper weapon.) So it seems the better option for troups may be the immortals if their other weapon option is the telsa carbine (24,5,-,assault.)
Of course, like most of the stuff about the necrons, I would count this as a rumor until we have the WD and Dex in our hands.