Let's see if you like my new math:
7 factions, 1 neutral "pack", 6 sets of 60 cards.
In the first set we got 5 factions that got 9 cards (Warlord + 8 Signature, 4 factions with 3 cards each), 2 factions that got 6 cards (Orks and Chaos wth 2 cards each) and 3 Neutral cards (3 copies of Calamity). That makes 45 + 12 + 3 = 60 Cards.
I think that, as you commented before, we'll get something like that in each set. I think each faction will get:
- A Warlord plus 8 signature cards
- 3 times 3 cards (3 copies of each)
- 2 times 2 cards (3 copies of each)
This would make: 9 + 27 + 12 = 48 cards per faction, this is, 336 cards, leaving 24 for 8 different Neutrals, as you stated.
This being said, I think that giving us 3 copies of each is a bit mean, since, in case you want to have 4 copies of some card you would have to get 2 units of one pack, meaning you will have a lot of spare cards. On the other hand, there are very few units/events/whatever that you really want to have 4 in your deck, so I think we'll be fine with 3 copies of each.
Relating this with deck building, once you have the whole first set you will have 60 cards per faction (21 from the Core and 39 from the expansion) apart from your 2 Warlords, so single faction lovers will have enough possibilities to test. In some cases, taking out 18 cards out of 60 to make a 50 cards deck (I'm not counting the neutrals here) will be a hard time XD
Man, I really want to get my hands in the whole Warlord Cycle =D