This isn't the first time the set of numbers; 1, 5, and 7 have turned up (or not turned up).
They're also the numbers missing from the coordinates.
Also, GlitterPanther, can you elaborate on the anomalies you found around the Glukkon's lip?
I can't really make anything out, and you seem to have a knack for it
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Edit: Odd, I swear I saw the @OddworldInc post a tweet, but as soon as I clicked the little '1 New Tweet' update bar, nothing has been posted for the past 3 hours...