New weapon in latest Tweet image?

While viewing the image embedded in the latest [url=https://pbs.twimg.com/media/Bl3sjsWCIAAJ_M5.png]tweet[/url] by Bungie, I noticed something rather peculiar on the Warlock. It appears to be an image of a face near his waist. What could the face represent and why does it appear to be surrounded by "light"?? I have provided an edited image above that once zoomed in you can clearly see the face. What are your thoughts on this? *Edit: Yes I see it is just the muzzle of a gun now and not a tomahawk (perhaps wishful thinking, lol). Now what about the face? Since we've established that the protrusion is a muzzle/barrel could this be a new exotic?? Soul catcher exotic?? The light I referred to can also be seen on the stock of the weapon above the Warlock's shoulder.