Delta wing design will be the perfect solution for this. More wing area, more lift, more internal weapons bays, etc..
I've noticed that a lot of these stealth UCAV's are subsonic. Turkish Aerospace wants the Goksungur to be supersonic. I am really interested to see how we will design this.
I personally think that some of its stealth capabilities will be traded for speed, and that the Goksungur will act more like an interdictor or penetrator (like a B-1 Lancer) rather than a modern stealth bomber. It will likely be used for shock and awe attacks, targeting pre-designated high value targets and devastating enemy supply lines before the main assault begins. In other words, it'll strike fast and deep in enemy territory. But isn't stealth a lot more effective nowadays, instead of relying on speed? Well yes, but lets not forget something pretty important. Electronic warfare. With our EW capabilities, I'd much rather we have a supersonic bomber drone with compromised stealth, rather than something which is subsonic but has a better RCS. It might sound stupid to some, but this is my personal opinion. I guess what I'm trying to say here is that I don't want the Goksungur to become another nEUROn or X-47B, I'd much rather it be something completely new. If it can have excellent stealth and speed then that's great, but I really want it to be supersonic. Its speed should not be sacrificed, the 1600km/h goal should be met.