Yep double what it was before so 15 million and 75 million cards (which will be combined). But there's some important things to take note of about how things went previously.
There were dice packs and untamed packs they both sold out very quick. They now go for $50+ a pop and fair game $2 or 3,000 DEC per Dice pack at the time. I can honestly see vouchers going for $20+ each easy since prelaunch has a number of huge bonuses. Slow limited supply and from what I understand even after prelaunch you'll still need vouchers that will be air dropped daily but at a faster rate and I think those go to SPS holders as well (not 100% sure on that part yet) but say it is then SPS has HUGE value in it right now even if you wanted to sell everything and not so much play the game. There are also far more players then there was when Untamed and DICE packs were around and most likely be another large explosion once these roll out driving up demand.