Could this possibly be a picture of the upcoming flagship M7 from HTC? EVLeaks certainly thinks so and they've been correct with several other device shots that they have posted up in the past. The M7 is widely expected to be announced later this month at a press conference, so it should be nearing its final form:
As you can see, the M7 is equipped with what appears to be an edge-to-edge display. Coming in at 4.7 inches, it's not the largest mobile screen we've seen, though this one features a full HD 1080p resolution. Other rumored specifications include a 1.7GHz quad-core processor and "ultrapixel" camera.
HTC has a press conference scheduled for February 19 in New York City and it is widely expected the M7 will make its public debut at that time. We'll be sure to cover the news as it happens.