Let's remember the description given by Natfka in his blog:
"The Stormfang Gunship has the look of half of a Caestus Assault Ram, and is on the cover of next week's White Dwarf. The previous rumors really list out its abilities well. It comes with a Helfrost Destructor, two twin-linked heavy bolters, two stormstrike missiles and ceramite plating, with power of the machine spirit."
And through BOLS there is a comment from Warseer:
"I should really have said 'love-child of a Caestus Assault Ram and a Stormtalon'. That is a better description of the model's appearance."
Is there anything in the codex that could fit with this description?
This illustration comes I think from the 3rd Ed codex. There are some gunships to the right that look more like Thunderhawks in Star Trek that a Caestus Ram. Moving on.
The below are most certainly Thunderhawks so not our Flyer.
The below doesn't look to be a Thunderhawk, and it is too narrow for a StormRaven or variant.
It is like half a Caestus Ram (check) with small wings on the side (Heavy Bolters supports? check) and some engines towards the end. The cargo area also looks bigger than a Storm Raven (capacity 16? check). Is this the StormFang? we'll have to wait a few more days but I think it likely it looks very similar. What do you think?