Apparently a report was published in November containing conceptual renderings of what the Dulles Metro station might look like.

Since the Dulles terminal is considered a historic building with preservation-worthy architecture, the design of the new Metro station was discussed during the Silver Line’s environmental review, and is constrained to follow certain guidelines. Therefore, while these renderings don’t illustrate the final engineering-level architecture (that doesn’t exist yet), they do show a concept that is very likely to be carried forward in general, if not in every exact detail.