What is this odd aircraft?
It appears to be a Celera 500L, owned by Otto Aviation Group.



This article has more information: "Unmasking The Bullet-Shaped Mystery Aircraft After It Reemerges At Victorville"


  The registration also provides us with a designation for this mystery
  plane—the Celera 500L. It is the only aircraft registered by the
  company with the FAA. The War Zone contacted the Otto Aviation Group
  by phone and they said they could not comment on the aircraft in any
  way. 
  
  This new high resolution image shows the rear of the airframe, which
  is the perfect companion photo to the lower resolution, front aspect
  image that we posted last April. We can now clearly see the five
  bladed, variable pitch, "pusher" propeller that will provide thrust.
  The airframe also features what appears to be all-moving vertical and
  horizontal stabilizers, and long, slender wings that are likely
  optimized for laminar flow. 
  
  The Bell X-1 like teardrop fuselage design, which includes a cockpit
  windscreen seamlessly blended into the fuselage, gives the aircraft a
  large internal volume and high aerodynamic efficiency. It's safe to
  say that efficiency is what this aircraft is primarily about. Even the
  prop size looks small in relation to the overall aircraft, which would
  point to the possibility that it makes very good use out of the thrust
  it has on hand.