Call me crazy. But most, if not all Android phones that are not Bing'd has, "With Google" branded on the back of the phone. If you take a look on the back of the HTC Vigor, "with google" is missing. Only 4GLTE & Verizon is listed .... Could this be the Merge on steroids? I hope not.
Picture of the Vigor:
Click to view quoted image
You crazy.
Its not the final hardware. Its missing several logos, noticeably the 'With HTC Sense', 'Google' and 'Beats' logo. (if it even has a beats logo, which it might not)
OR
HTC could be doing something different and limiting the logos on the back to theirs and Verizon's. Who knows.
I do know, though, that this won't be a Bing phone. Not a chance Verizon or HTC would allow that.
Edit: And just to put a nail in the coffin, here's a pic where the google search box is visible. The Bing one is black, so this is clearly not Bing'd.