OK, I'm also having extraordinary luck for the first time ever. I just bought ten classic packs with gold and pulled legendaries from three in a row (Pat Nagle, meh; Edwin VanCleef and Alexstrasza? Hell yeah).
I even had great luck on rares; only 2 of 12 were duplicates. And hell, I'm even getting the exact epics that I want: Snake Trap from my classics, and a Vilespine Slayer on my first Un'goro pack! Merry Christmas, everyone!
I had five packs each of Un'Goro and Classic stockpiled for the change.
Second pack of classic, Cenarius.
First pack of Un'Goro, my first golden ... The Voraxx.
Second pack of Un'Goro, Clutchmother Zavas.
Must be karma in getting the latter two, as Un'Goro awarded me the quests for Paladin and Warlock in the first 10 packs on opening day AND gave me duplicates of both. Grr. Sucks that so far nothing in Paladin KoFT previews seems aimed at improving that quest, while warlock has a tepid legendary but not much else supporting discolock.
/gotta fight the temptation to blow money on the other expansions
//wonder if Blizzard did this intentionally, hoping word of mouth would get extra sales and coin stockpiles reduced
It just worked for me. I'm a NA region player, been playing since open beta. I think I've missed less than 10 dailies total since the game started (just to let you know how much I play). I've been saving packs since the announcement, here's my breakdown.
Classic: 23 until next Legendary... (3 already saved), Gruel on 2nd pack
Old Gods: 23 until next Legendary... (Bought with gold) Princess huhuran on 7th pack
MSG: 20 until next Legendary... (Bought with gold) Kruul on 4th pack
UNG: 31 until next Legendary (5 already saved, rest bought with gold), Ozruk on 9th pack
Overall, I think the drop rates seem better as well. More rares, epics, and goldens than normal.
Thanks everyone for keeping this thread going and giving me the courage to try while hoarding for KFT. I hope this helps someone!