In the most recent update for Classic Season of Mastery Patch 1.14.3.43086, the Wrath of the Lich King logo has been discovered in the game files. Less than two weeks ago, Blizzard sent out a survey to the community asking about Wrath of the Lich King and now the logo has been added into the Classic Era Public Test realm data.
This is certainly a strong indicator that Wrath Classic is happening, if you had any previous doubts. One of the most interesting bits of this update to the ManifestInterfaceData folder, both the Burning Crusade Classic logo and Wrath of the Lich King logo were added.
As of right now, Classic Era only contains Vanilla realms, with max level 60 content. Could this mean that Burning Crusade realms could be added to the Classic Era client in the future?
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