Hearthpwn

It looks like Magic Find purchased all of the Curse forums.  More than one mod team had moved on. Curse probably set deadlines to archive the sites in order to pressure any interested buyers to close the deal.

As for the survey, I'll use both sites for a while. 

This site is a shining example for online communities.  Well done.  Catch you on the flip side.

No.  No difference in rewards or content. 

The only thing I don't know is if you can purchase all 4 remaining wings with gold today.  Since the purchase of the last wing triggers Zayle being added to your collection, I don't know if that is available today for people purchasing with gold.

I always like math problems, so I tried to figure out how you came to the 500 in the statement...

I don't think I should need to open 500 packs to complete a card set

Aside from that, I believe 100 dust is only the average dust per pack when you are willing to dust all cards you open.  Including all legendaries, all epics.  If you are trying to acquire a complete expansion set, you won't be dusting any legendaries and you'll be keeping 2 copies of each epic.  When looking at 30 packs, you wouldn't get 3000 dust if you keep legendary/epic cards.

I think around 350 packs is how many packs a person with average luck and average drop rates would require for a complete expansion set.

 I dreamed of having a full set of an expansion so I asked this question: If I never open a triplicate common, rare, or epic before having them  all, how quickly would I obtain a full set? 

Using average drop rates from the pitytracker  website - legend 1.2%, epic 4.4%, rare 22.9%, common 71.5% - if the rule for legendaries applied to epics, rares and commons, the results I found were:

1. You would have all commons (2 copies = 98 cards ) after 28 decks. All rares (72 cards) after 63 decks. All epics (54 cards) after 246 decks.   At this point, you would have 15 legendaries.  if you were to dust all common golds, rare golds, and duplicate common and duplicate rares, you would have 11k dust and need 12.5k dust to complete the set.

2. After opening 257 decks, you would have enough to craft the rest of the legendaries, when under a "no triplicate common/rare/epic" rule

What do I take from that under current rules?

The lack of a "triplicate" rule doesn't matter for commons and rares, because if you are trying to get a complete expansion just from opening packs, when opening 260+ packs you are going to get all of them or it will cost very little to craft the ones you don't have.  It comes down to how many redundant epics you open.

At 297 packs - 40 packs beyond 257 gives you an average of 2.4 more legendaries, 9 epics, 46 rare, 143 common.  The 2.4 legendaries means you make 3800 dust available to craft epics, for a total of 6.7k dust because of opening 40 more packs.  Enough to craft 17 epics.  And would also mean that you were disenchanting 17 epics that were triplicate+(from the first 257 packs), another 1.7k dust , enough to craft 4 epics.  So each 40 packs beyond 257 would let you improve your epic collection by 21 epics.

TL:DR   it would take a real world simulation to tell you an average of how many packs to open.  If my math is right, a person with average RNG luck can't do it in under 257 packs, and estimates of 300 to 350 for an individual seem right.

(edit: pack totals changed slightly)

You can't craft it golden, like you (both) said.  You also can't disenchant it, which I think was also Nargacuga15's meaning.

There was an insider's look into the adventure -- it explains the tavern encounters and mentions new card backs.

PCgamer

Found I problem with my information.  You can't disenchant golden Zayle. So you are stuck with it, you can't convert it into another legendary (found this in the AMA)

 would present the list of differences like this:

• -8 rise of shadows packs
• -hero skin
• +1 golden classic pack
• +1 normal legendary card
• +golden Zayle (legendary)
• -golden legendary card (random)
• +4 chapters of the adventure
• +arena prize in addition to card pack

Since the first chapter of the adventure is free to everybody and appears to award 3 packs; I think the $20 gives you 4 additional chapters, 12 packs, golden Zayle, golden classic pack, So the second option gives you 72 packs (50+12+10).

If you know that you would want Zayle, then the second option has a big advantage because you will never have to craft it.  I think I read that you can't craft the golden version of Zayle, you can only get it through the adventure.  You can try the card out (more fun), and if you end up not wanting Zayle, it has the same dust value as the random golden legendary in option 1.  (EDIT: no dust value, can't disenchant). If you KNOW you would never want Zayle, then option 1's random golden legendary is slightly (EDIT: much) better, you may get a legendary you want.

I think the adventure will be a large part of the story of the expansion and likely will tie into the story of the next 2 expansions. 

For me, I'd look at it as "costing" 8 packs and the hero skin in order to "get" a golden Classic pack and the adventure,  You can easily make up the 8 packs and it sounds like the hero skin doesn't matter much to you. 

EDIT: Incorporated info from AMA