Last night Blizzard aimed to implement a hotfix to increase the amount of materials gained whilst disenchanting/shattering. Luckily this hotfix failed, but it will still be coming soon.
For now this means there should be no direct economy change, although perhaps some people may have quickly sold their goods when this hotfix was announced.
I would assume this hotfix will decrease the value of various items such as infinite dust when it goes live, so it may be worth selling some excess stock.
Official fail post: World of Warcraft - English (NA) Forums -> Disenchanting & Shattering Hotfix