Update: Unfortunately, neither ASUS nor NVIDIA had anything of value to say about this device:

NVIDIA's response:

Officially, no comment on unannounced products.

ASUS' response:

First I have heard of it, especially since the next tablets up on the roadmap are Windows based.

As many readers have already pointed out in the comments, perhaps this will be a Windows RT tablet. Time will tell.

This is a curious one; a mysterious ASUS tablet has shown up out of the blue at the FCC today, with the model name 'TF500T'.