It’s a Dyna-Soar.
Or something like it.
Popular Mechanics has a sneak peek at a Lockheed Martin design.
I see a ghost of the old Dyna-Soar in the overall look.
For those who weren’t aware of it (and I only have a few glimmerings myself), the Dynasoar was a reusable manned space vehicle that was developed in the 60’s, intended for military use.
I personally first heard of it when, upon telling my grandfather how cool it was to watch the very first shuttle launch, he told me half-sadly, half-bitterly, that we could have had something smaller, and working years ago. He’d worked on the ground-based power generation and distribution systems, if I recall correctly.