Official product videos are hardly on top of our list for upcoming smartphone leaks, but stranger things have happened, right? A curiously looking prototype has made an appearance in the freshly announced HTC EVO 4G LTE promo clip, and made us wonder if we didn't accidentally (or not?) catch a glimpse of the HTC EVO 3D's possible successor.

As you can see above, the dual-camera layout of the prototype, along with the position of its dual-LED flash certainly points in this direction. Of course, this could well be a prototype only device, which will never see production.

And here goes the promo video itself.