Got my hands on the production L3 now(should be the same one you guys are getting from the crowd fund).
The leather case is like baby blue-ish, color is pretty close to the pictures i posted earlier. From the picture I thought it would be some sort of PU hard leather, but it feels quite premium to the hand and I think it is real leather.
Another difference from the test units is that L3 now has glass screen protector instead of plastic ones. Also, the metal finishing feels slightly more refined.
Have not test the sound yet, will post some pictures later.