Inscription Materials

There’s a lot of speculation about what materials are going to be needed for the Inscription - the new crafting profession in WoW Wrath of the Lich King. The official line from Blizzard (via the WoW forum) is
“Not as of yet. This is still a work in progress, but you can bet that as we get further along in development, we’ll start getting the word out for everyone.”
but many players are speculating:
• enchanting dusts/essences/shards
• some random unnamed line of stuff that will be “prospected” off enchantment mats
• an obscene amount of Thorium
• mostly cloth (like tailoring) and enchanting items (such as dusts)
• self supported like enchanting where you can get the mats for it without needing a seperate gathering profession
• herbs - you can mash them into paper and drain bits of them into inks
It makes sense (to me at least) that Blizzard will stay away from using mining, ores, or jewels for the inscription skill. Too many professions depend on mining already and herbalism could certainly use a boost.
In any case, pay close attention as launch draws near - there may be a chance to stockpile some items or reagents that are currently easy to get or inexpensive that will suddenly skyrocket in demand (and value) once inscription is live.