Well, I was looking at building a 1,999 +1 point army list. In other words, a 1,999 point army list (so that you can only field one FOC) but it's okay if you go one point over. The progression I was hoping for would be something like 1,500 points to grasp the new system, 1750/1850 to expand horizons a bit, and then the final "2,000" point army.
What does that mean?
A) It's a typo. You can just take 4 Heralds as a single HQ choice.
B) It's poorly worded. You can do the four-for-one thing as long as the choice goes in your primary detachment. If the detachment is an ally, you only get a single Herald, and it takes up your one allowed HQ slot.
C) It's dumb. You can only take Heralds in a primary detachment, otherwise you can only take a Greater Daemon or a Daemon Prince.
Personally, I lean toward explanation B, but I'm bracing myself for the eventual FAQ to say C is the correct interpretation.
Those Bloodletters are really where my offensive punch will come from. AP3 swords, and Strength 5 on the charge make these guys excellent shock troops. The possibility of two extra attacks would turn these guys into an absolute wood chipper of gory glory. Seventeen of these dudes (like I have planned) would just delete squads.
In the end, I have a fair amount of painting to get done before I even really should start thinking about adding Daemons to my force any way, so that gives GW a while to decide what's what. The thing is, I have a lot of time to think on these things and to build army lists while I'm here at work. Oh, well. back to the books I suppose.
P.S.- Did I mention it's dumb to put the Champion of Chaos rule on Cultist Champions? Well it is.