So far it sounds like the viable swarm tactic will be 3 large units of scarabs running under night fight. Necron Initiative 2 boardwide - That will never get old...
Grab the White Dwarf - Take a look at the army list put together by the Author of the codex - in a 2,000 point army he took over 500 points of HQ. This is the guy who wrote the codex? Looks like he firmly believes the only way to win with Necrons is fill-up on HQ specials and a few of the new Mech units. Not a good sign...