I don't think MMO-Champion meant to imply that the Eye of the Legion would be available any time soon. It looks more like a 'Hey! New data in next patch!' kind of announcement.
Ever since the 4.3 PTR
, Blizzard recently started adding data regarding future TCG loot on the PTR. So while there isn't any information on the decks yet, the pets themselves are starting to be previewed earlier and earlier. I'd just keep in mind that the release order of each deck, names and even the pets themselves could be changed or swapped out since there's months of time between each TCG expansion release.
Here's a rough possible run down of what the next few TCG expansion decks and the comment pet loot cards will be:
1. Crown of the Heavens deck - Gregarious Grell (release date: early February)
2. Tomb of the Forgotten deck - Sand Scarab (likely release date: one to three months after Crown of the Heaves)
3. Timewalkers: War of the Ancients deck - Eye of the Legion (likely release date: one to three months after Tomb of the Forgotten)
You can view a more complete list of yet-to-be-released pets here