Even though the recent FAQ update was small, the impact it has on Daemons for list-building is substantial. No longer must you worry about being able to handle six flyers or more. That opens up so much space in a competitive list.
Here's stuff you don't need to even consider anymore:
Fortifications with quad guns/icarus lascannons
Officers of the Fleet, and therefore a CCS
My most competitive list used all of these, but I don't need any of them anymore because I can just dodge my opponent if he brings a jillion flyers. I don't care how many come on at once. I can just deny them shots. You may still want a fortification for a Comms Relay, and the Aegis with Comms Relay is probably the best choice now to be quite honest, but I wouldn't take a fortification at all. This frees up tons of points for things like Daemon Princes or Manticores.
In fact, there isn't a whole hell of a lot of need or use for anything IG anymore besides a Vendetta. That means lots more points for Daemons.
Here's what I'm thinking at the tournament standard level of 1850:
Daemon Prince, MOT, BOT, Breath, Wings
Veteran Squad, Bolt Pistol (Rides in de plane.)
There's a whole bunch of valid ways to expand this to 2000. I would add one Plaguebearer to this list and take it to Stones River (1863 point limit) were I not leaving the country next week (dammit...).
Between the two FMCs, and the Vendetta, you can handle the flyer list that poses the greatest threat to you at the moment, which is, of course, Triple Heldrake. Send Bolts of Tzeentch up dey' ass.
It's too bad this will completely change in a couple weeks, but at least things are staying interesting.