This is awesome! I had read that the FireTV worked with some Logitech keyboards. I had a Logitech mini keyboard that I originally bought to use with my Logitech Revue. The mini keyboard is really sweet with a small touch pad that works in mouse mode. The post stating that a Logitech diNovo keyboard worked said that the mouse didn't. This initially lead me to believe that my mini keyboard was the one referred to here, but I now think not.
Anyhow, I tried and tried to get it paired via BT. I even side-loaded the standard Settings app and tried pairing it that way, but no dice. Tonight, I wondered if I could get it to work with my Mac. It came with a "Unifying" dongle that I had tried plugging into the FireTV with no success. I downloaded the Unifying software for my Mac and plugged the dongle in. It mentioned something about pairing (don't remember what exactly), so I paired my mini keyboard and was happy to see both the keyboard and mouse portion working just fine. Then I wondered to myself "Gee… I wonder if it’s linked to this dongle now, and will it work if I plug it into my FireTV"... So, I moved the dongle to my FireTV and was shocked! Right away, the arrows worked, and when I put it in mouse mode and touched the pad, I had a circle on the screen following my finger movement! And the Home button on it takes you back to the Home screen, like it was made for FireTV!
This really opens up using the many apps out there that are written with only for touch interfaces! I was able to navigate Xfinity TV Go from across the room using only this mini keyboard... At the moment, you can still get these through Amazon for $49.99 (though I'm new here and can't link to it - Search for "Logitech Mini Controller for Logitech Revue and Google TV" if you want one).