Just wanted to point out, as a follow-up to my previous post, that I just logged into beta to check a few things, and the ink trader is now trading various inks for the new Ink of Dreams, not the old Blackfallow Ink.
For some reason, Snowfall Ink, Inferno Ink, and Starlight Ink (the MoP rare ink) are still listed as costing 10 Blackfallow Ink, but this is likely an oversight, and I wouldn't be surprised to see this changed in the next build or two.
So, the point in all this? Keep an eye on MMO-Champion and other WoW news sites, because in addition to hopefully getting some news about an MoP release date soon, we will get at least a week's notice before patch 5.0.3 goes live. Be sure you trade down your Blackfallow Ink before that patch goes live!