[Update #2]: Wrath of the Lich King Classic, the very peak of the original WoW era, has now been unleashed.
[Update ]: World of Warcraft Classic is giving players a fancy new dragon mount for simply playing Death Knights.
World of Warcraft's second, and very likely final, Classic expansion Wrath of the Lich King will be arriving later this year without the controversial Dungeon Finder. All of the other content will be fully available, and you can also expect to see a couple of extra improvements like additional character customization options, personal Arena rating, and even the ability to level a Death Knight character to 70 before the expansion itself goes live.
Speaking of which, you might want to start thinking about your leveling route as Blizzard has just accidentally revealed that the expansion is nearly upon us. According to a brief update on the World of Warcraft website, Wrath of the Lich King Classic will be unleashed on September 26th, which means that Death Knights will most likely become playable in either late August or early September.
The date was quickly removed and can no longer be found anywhere on the World of Warcraft website, so it's also possible that this was a simple mistake and that the release date is going to be something else entirely. I highly doubt that's the case, but just to be sure I'd avoid making any concrete plans just yet.
Once more information becomes available I'll make sure to let you know. Until then, you can read more about Wrath of the Lich King Classic over at the WoW website.