This week’s season finale ended with Coulson writing mysterious symbols on a wall, apparently while still asleep. So, what do these symbols mean?
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We’ve already seen these symbols twice elsewhere. The first sighting was on the wall of a S.H.I.E.L.D. lab a few episodes ago. Then this week, John Garrett started drawing them right after he was injected with the same drug that brought Coulson back from the dead. This drug was made from the blood of a blue alien who appears to be a Kree, one of the major players in the Marvel comics Kree-Skrull War and Secret Invasion story arcs.
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Without going into too much agonizing detail here, it’s kind of a big deal if Agents of S.H.I.E.L.D. introduces hints of Kree or Skrull culture and technology.
We already know that Kree characters will show up in Guardians of the Galaxy, but that all takes place on other planets. If Kree or Skrulls are on earth already, then we could be in for some version of the Marvel comics Kree/Skrull storylines. The next clue would be the revelation that some human characters are actually aliens in disguise, which has already been foreshadowed with Coulson’s protege Skye. Her origins are mysterious, and almost certainly not human.