Those who have been around, or who have put in money. That's how pre-sales & stuff usually work: rewarding your most profitable customers.
I just hope not too many noobs get tricked into spending a bunch of money on vouchers, when all they have to do is wait for the regular sale instead.
Potions are $0.04 or $0.05 - so even getting 5x each for each pack is only an additional $0.45 per pack. If you spend SPS, that 10% discount basically covers it.
Thanks. I was referring to the cost of quest potions - looking at the amount required for bronze players to get cards at this point versus through packs.