I don't really know what you mean by a completely different and superior design. Today, designs are no longer made by a person's intuition on aerodynamics and structural design. Its all more of computers, wind tunnel modeling, structural strength analysis and modeling, lets just say its more of computers doing the designing. Because we all face common laws of nature and physics, like in aerodynamics and radar, these common laws will force commonalities in design. Because of this, I kind of doubt that stealth fighters would look much different from each other. In fact they will all probably look alike.
As for the UCAV concept, its called the Anjian, or Black Sword.