Shamelessly ripped from Stratfu:
* Glyphs for your main spec (consider changes in talent trees and new glyphs)
* Glyphs for your dual spec
* Duplicate minor glyphs for dual spec
* Multiples of any glyphs you may be swapping out for learning encounters
* High ilvl gear for Flame Leviathan
* Consumables!
* Secondary spec gear enchanted/gemmed if appropriate
* Run speed to boots again! (DK aura nerfed)
* Patience for lag and crashing servers
And possibly the most important:
* Mods updated, ideally test your UI on the PTR
* BigWigs (has Ulduar boss info already — DBM may also? I haven’t looked)
Do not to rely on Curse and WoWInterface to be up tomorrow — grab stuff now, the major mods are already up to date. And the PTR is still up as of this writing, so you can hop over and make sure you don’t have errors.