What is Nokia up to?

Today, the company took to Facebook again, with yet another cryptic message. It's a picture of a device that looks like a set-top box, or perhaps a Mac mini-type of PC, with a scarce text explanation, informing us that Nokia is "up to something" and the date November 18th scribed above it.
So, we guess tomorrow is the big day, but it seems Nokia is going to stay away from the mobile business for now. What do you guys think this is? An Android TV set-top box? A super-powerful mini PC? What's in the b-o-o-x?
source: Nokia (Facebook)
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