First start off by saying 4.0.1 is tomorrow, most likely according to mmochamp. I was reading patch notes and noticed this under the hunter section.
Ammo
"Ammo is no more. As a hunter, you're just that good now.
Any quivers or pouches used to store ammo will automatically be converted into a bag of roughly equal value."
Dragonscale Ammo Pouch - 28 slots.
20x Icy Dragonscale
2x Heavy Borean Leather
mats are roughly 20-40g depending on server
If you have some of these ammo pouches on you before you the patch 2morrow. they will convert into "roughly equal value" bags which most likely means at least 20+ slot bag which runs at 80g+ in AH.