Well it apparently acts as a wifi -- but, but, but, you'd still have to have apps that would use it, I'm still very skeptical that the Fire Movie player will play from it and that sort of thing. Now I may be completely wrong, but I personally would not be willing to take a chance on it working (certainly not without rooting the Fire).
The other issue I see is that if it is acting as your wifi device then your browser etc is not going to work properly. Again, maybe I'm wrong, but I'm still betting against it working the way you are thinking.
I'd suggest you post your question on Amazon in the Kindle Fire section and see what they say. Maybe here:
http://www.amazon.com/forum/kindle/r...TxETMG4G5L19AW