The client lists about 1,795 new quest IDs and six new flight points. A salvage system, a reagent bag, a bank of around 96 slots, 42 new mounts including devilsaurs and Galestriders, new class sets with set bonuses at every piece, and Vanilla's never-released gear sets all appeared in the first week. Rulesets were explained: no realm list, one faction on PvP, a way out of Hardcore.
Blizzard confirmed in-combat addon restrictions like retail's Midnight, no shared tagging, and that there are no Shaman tanks for now, with a 'never say never'.