HTC EVO Shift 4G. Factor in the noticeable lack of front-facing camera, silver trackpad and those throwback flat keys, and we're even willing to forgive those hastily penciled watermarks on the keyboard and on top of the clearly 'shopped screen. Even if this shot is legit, we haven't seen the full device yet -- it sure looks like this Knight is wearing a suit of plastic armor around the edges.
In possibly related news, Android Central nabbed an alleged screenshot of a Sprint database showing an "HTC A7373" handset coming to Sprint on January 9th, and while one Russian e-tailer seems to think that codename refers to the GSM-friendly Desire Z, we have to imagine a Knight / Speedy / EVO Shift release is far more likely than a T-Mobile G2 redux on Sprint's CDMA frequencies.
Update: Just to be clear, there are a few things about this image that irk us, not least of which that pasted-on screen. We're inclined to think this might be a dummy unit that was touched up to look like a real phone.