Now, the f30post forum has come up with what it says are patent drawings of the new 4GC (originally from Chinese site Autohome.com), giving a glimpse of what the coupe-sedan-thingy looks like without its camo in the way. What we're seeing is seemingly a mix of the 3 Series GT (noticeable around the rear window) with the larger Gran Coupe styling, while retaining the current 4 Series front end.
We can't say it looks great, but as these are merely renderings, it's far too early for us to come to a final conclusion on the overall look of the 4 Series Gran Coupe. Have a look up top at the patent images. We've also included our spy photos of the new Gran Coupe below. Let us know what you think of the latest niche product from BMW down in Comments.