The latest render looks suspiciously like last month's "perfect gold" shot, and gold border along the front of the device notwithstanding, could simply be somebody playing around with Photoshop.
We've seen a metallic silver model of the Galaxy F before, but we have reason to believe that the Galaxy F is a real device, given the alleged live shots we've seen of it next to the Galaxy S5. We first heard about the Galaxy F at the beginning of the year, and many rumors since then have pointed to the first "premium" Galaxy smartphone, set to sport not only a metallic chassis but also a QHD display.
Of course, even if the finish does end up looking like that, Samsung's reliance on polycarbonate and imitation textures (like the faux-leather on the Galaxy S4), could result in an faux-aluminum panel like that on the LG G3.
The source also mentions a 2014 announcement, so hopefully we'll know more about the Galaxy F before long.