Patch 3.3 is only barely out on the live realms, and already, there's a controversy with the new epic ammo recipes. Lassirra says that hunters are concerned that the requirements to make the ammo are just too high. Blizzard had promised to make getting epic ammo easier, and this still has the requirement of having a high level engineer, with the extra charge of requiring a Goblin engie for the bullets, and a Gnomish engie for the arrows. And even after you find a 450 Engineer in the right spec, you still have to get a couple of Crystallized Shadow or Earth together. That doesn't sound "easier" to me, either.
Let's not forget, however, that this is cutting edge (no pun intended) ammo -- this isn't the kind of vendor junk you just fire while leveling. It's a 30 point DPS gain from the previous high level ammo, and that kind of increase probably does justify a little tougher requirement to make. Of course, it'll probably work out so that other classes get that increase normally through their itemization, but that's just the way it works for hunters. If you want the new ammo, you'll have to find an friendly engie of the right spec with the right skill Honored with the new Ashen Verdict faction, and then keep them supplied with as much Crystallized Earth and Shadow as you can find.