Yeah, if the Opera corporation gave a blessing to use the leaked code then that would be great; I'm not going to look at it until I know for sure I'm not going to be sued.
It's too bad, I hate that we basically only have two browsing engines that people take seriously: Blink/Chromium and Safari for iOS. Firefox is there but it lags pretty far behind those two. Having a little more competition in this space could be good.