The snap was uploaded to Flickr and linked to by Twitter account @evleaks, Pocketnow reports. It's listed as being taken with the HTC One, though it could have been cropped and compressed for uploading to the web.
According to the Exif data, the aperture is f/2.0, with a focal length of 3.6mm, and ISO speed of 103.
HTC has said it'll "kick off a new sound and camera experience" this year, which many think is a reference to the new imaging skills of the forthcoming flagship. Earlier in the week, Pocket-Lint claimed the new handset would ditch megapixels in favour of ultrapixels. Sources told the site that the device's camera would be made up of three 4.3-megapixel sensor layers that would combine to give a single image. Which would yield better results than just shoving a 13-megapixel sensor into the mobile.
The sources said three lots of data would combine to make a crisper, cleaner image, with more accurate colours.
The HTC One/M7 is due to be announced at an event on 19 February. HTC head honcho Peter Chou has already showed off the device at a company knees-up, where he whipped it out and started snapping away. He also led a chant with the crowd. "M7! M7! M7! HTC One! HTC One! HTC One!"