Hi, guys, i'm really sorry if this thing was discussed already somewhere, but here what i got.
my native language is russian, so tooday i have read THIS. I'm prety noob (as i sayd) so it was new for me.
For those who dont speak russian i'll translate a little. This guy says that some items that can be bought in AH for 2-5k AD will cost at last 3-10k after the Fury of the Feywild release. Open the link, scroll down and you will find huge Picture with some items (one of the chiepest on the AH) and their salvage "cost". I guess you will understand everything then. Most of this items costs 40-50% of this "cost" atm.
So you can buy some crap lvl 60 epic items, wayt 3 days, and sell it for twice price or salvage it.
Also, if you will salvage something like 300 items, you will get really huge amount of Rough Astral Diamond for 1 character, so he recomend to make some alternative characters and split your items between them. This will make you rAD -> AD transfer much faster.