What we can conclude from the posted image is three basic things:
1. There is a "dark" secret.
2. There are 5 pairs of eyes involved.
3. We will get answers today (I'm blogging this at 4:41 AM lol).
We since saw another teaser about guessing who anchors are secret new group:
Clearly, the image and description allude to Wash Buckler.
If you look closely you'll notice his attire is black and his blue tentacles are now more of a gunmetal grey.
It makes sense this could be a new contingent of in-game variants. Whether this ties in with Dark Spyro from SSA, or is more akin to the Legendary Skylanders we don't know. Will this just be a recolor or will there be a different pose? Will the moves and powers be standard issue, or will there be different or new upgrades for this dark legion? At this point we just don't know; it is all speculation.
I'll likely be at work when the reveal breaks, but rest assured I will assemble the information and relay it to you!
You can get the info first hand by following Skylanders Game on Twitter, Circling them on Google +, or simply checking their Facebook Page.
I can make out most of the eyes (and maybe all of them in all honesty), can you?
Stay tuned for the big reveal!