Didn't preorder, I have enough gold for about 30 packs, and the dust for a couple legendaries. I'm hoping to get lucky, Haha!
About the dust though, I might be in the minority, but I feel like it's pretty generous tbh. Maybe it's because I played magic the gathering for a long time, but if I could have traded any 4 mythics for any mythic I wanted, we'll that'd be insane to me haha.
I guess I just look at it like, certain cards are just more valuable than others, but since in hearthstone they all have the same dust value, then it's a pretty good deal to trade in your crappy cards to obtain the good ones.