Avengers: Loki's Army Race?

At the end of the 2nd Avengers trailer, Loki claims to have an army. In the most recent trailer, we get a few glimpses at the army. In neither trailer are we told who the army is, of what race the army is composed. I would like to pull together a few resources upon which we may base speculative answers to this question: What is Loki's army?



First, let's meet our contestants. This page offers eight possibilities:

Skrulls
Frost Giants
Badoons
Annihilus and His Minions
Knights of Wundagore
Sons of Muspell
Atlanteans
Alpha Cenaurians

The page briefly summarizes the pros and cons for each race. If we ignore the Frost Giants as "too predictable" since they were the villains in Thor, then the strongest cases can be made for Atlanteans or Sons of Muspell:

Atlanteans:
There were at least three hints at Atlantis in Iron Man 2:

1) The Oracle Dome.
2) S.H.I.E.L.D. 'Target Map' includes Namor's 'Fortress of Solitude'.
3) Vanko's workshop wall: 'Atlantis Discovered' News clipping.

The problem is that Atlantis may be reserved for the Iron Man franchise, rather than have it bleed over into Avengers. Some speculate that Iron Man 3 might be a retelling of the Demon in a Bottle storyline, so Marvel may be saving Namor / Atlantis for this film, rather than spoil it in Avengers.

Sons of Muspell:
This page compares the attack scenes from the Avengers trailer with pages from an old Thor comic. Some of the attack scenes are quite similar, but a few pages from a Thor comic seems to not be evidence enough for a strong conclusion.

I'd like to offer another piece of evidence that I think throws the 8 possibilities listed above into question: the package art for the Avengers LEGO sets:




As we see in these images, the members of Loki's army are silver and gold. They are also unnamed on the box art. If Loki's army were composed of a known race from the Marvel universe, presumably they would be named on the LEGO sets.

That's all the "evidence" I've found pertaining to this very important question. So, what do you think? And before you go with the token 'SKRULLS!' response, know that Marvel Studios President Kevin Feige said they are not Skrulls, even though they're probably Skrulls.