World of Warcraft will be taking its servers down for four hours tomorrow for maintenance and the application of the new 7.1 patch, bringing the return to a classic raid instance as a mythic dungeon, PvP changes, new pets and even an invasion of dinosaur falcons.

Players can expect to be offline from 7 a.m. PT / 10 a.m. ET until around 11 a.m. PT / 2 p.m. ET, give or take as the servers are updated. The Battle.net interface should have already started preloading the patch, so once the servers are back up, players will be able to jump right back in.

As far as the patch contents, players will be returning a Karazhan in Deadwind Pass, a popular World of Warcraft raid dungeon in the Burning Crusade. It has since been dormant, visited only by players looking for transmog gear or seeking to solo a particularly irksome boss as payback for bad raid memories. Now it will be a mythic 5-man dungeon for 110-level characters, with eight bosses and quite a few changes from what raiders might remember. Several bosses will be familiar, but the Opera has three new settings, and to new bosses will conclude the dungeon.

Other additions include a new Suramar storyline that will fully unlock over the next nine weeks, eventually leading to the new Nighthold raid and a new mount; a quest line to unlock some new World Quests to stem the efforts of Helya in Stormheim; an invasion along the Broken Isles by a bunch of new Falcosaur creatures that could drop a new mount, as well as regeants for new cooking and first aid recipes; new pets and epic pet battles, and new PvP boosts to artifact power.

The Legion expansion, released at the end of August, has reinvigorated the franchise a bit, with reviews saying that the expansion is one of the freshest World of Wracraft has seen since Wrath of the Lich King..