Timewalking will be part of an event that will run over the weekend every week. The event will feature two randomly selected old school dungeons with a new “heroic” difficulty. According to Blizzard, “When you Timewalk these dungeons, you’ll find that your character’s power and gear has been scaled down to a fraction of what they normally are. For the first time in years, some dungeons you outgrew long ago will once more put your skills to the test.”
However the good news is that the items that drop during the Timewalking event will be scaled to the level of your character, so despite walking in with scaled down gear, you could walk out with brand new upgrades. At the moment the dungeons that will be part of Timewalking include The Arcatraz, Black Morass, Mana-Tombs, The Shattered Halls, The Slave Pens, Ahn’kahet: The Old Kingdom, Gundrak, Halls of Lightning, The Nexus, and Utgarde Pinnacle.
Patch 6.2 is currently undergoing testing on the Public Test Realm and will add a host of new features to the game, such as Mythic difficulty for dungeons, new mounts, and ship building, just to name a few.