Waiting is pain, there is no sweet torture, only dull backstabing pain of waiting. So I thought maybe there is some Lore, some Spirit we can find in the parts already revealed to us. I took into account all the info about the cards i found so far - and here are the facts.
There are 226 cards, 12 Heroes, 120 cards in Player deck, 10 Quest cards, and 84 cards of Encounter deck.
I tried to figure some info from the cards spoiled so far (numbers on them) and i got the following results.
1-12 x 1 Hero cards - no comments
13-27 x 2 = 30 cards in Leadership sphere
28-42 x 2 = 30 cards in Tactics sphere
43-57 x 2 = 30 cards in Spirit sphere
58-72 x 2 = 30 cards in Lore sphere
So far all fits into the following scheme - 4 decks of 30 cards each for each Sphere - average two copies of each card. It seams that we will eventually be forced (by our greed of course) to purchase more copies of the starter.
Now encoutner deck
73-117 x 1,87 = 84 cards - this deck seems to hide most inside. It is clear that number of different cards will vary... unless we do not know everything yet - shadow key (french site posted its picture) seems to have number 110 so... though it is unique to the quest... it is still consider to be part of encounter deck. This deck can spread into 119 but... no evidence so far. We shall see in few weeks
It seems that encounter deck can be split into two parts - generic part (common for all adventures to come) and unique part - used in specified quests.
118-127 x 1 = 10 Quest cards again it is just estimate - 122 is the only fixed point here - Beorns Path.
Now i wander how much effort will that take to move from one adventure to another. Shall we detach all cards - sort them according to their type and create another deck part by part and then shuffle it?
Lets assume that Shadows of Mirkwood is all on the market and we get roughly 170 new cards in the encounter deck (60 cards - 1 hero - 3x9 player decks cards-3 quest cards) x 6 adventure packs. If we just add them all adventures will take 3 times more time - 84 cards at starter deck - 234 cards after first sets of adventures... i feel there is some mechanism we do not know about yet that controls it. Hopefully some people who have already touched the game shall answer soon.