Blizzard has just updated the Classic Public Test Realm to the Wrath Classic Pre-Patch. This content is level 70 capped Burning Crusade Raids and Dungeons, where players can create Death Knights, players can level Inscription, but Northrend is inaccessible.
As of right now, it doesn’t look like the Prince Tenris Mirkblood has been added to Karazhan nor have any of the Pre-Patch events been activated.
No Prince Tenris Mirkblood behind the Blood Drenched Door.