Nokia RM-877 visits FCC wearing AT&T banding, could be the Nokia EOS
While the first thought that comes to mind is that this is the Nokia EOS, which is expected to be unwrapped July 11th during an event in New York, the second thought that comes to mind is also the EOS. That is because the documents mention the testing of the device with a camera grip, model PD-95G. Also tested was an optional wireless charging cover as well.
source: FCC via Engadget