I flew out Thursday evening...... the Sky Club was busy but not “full” even with the construction area taking up so much room. The back door by the bathrooms was open to an area with more seating and a few folks were in there. I’m guessing that will be the “swing” space for the re-build. From my days working at DCA (for AA), I seem to remember this area to be a meeting/training room. You entered through the door right next to Delta’s protocol office. Keep in mind, this was over a decade ago. I’m all but certain I attended a security meeting there with all the airlines.
As for the club experience, there was an empty bar stool so I just sat there and talked to the great bartender. Anxious to see how this unfolds. I wish I’d paid better attention to some of the renderings on display. They could bring the check-in area out onto the atrium (like AA on C con) to open up a bit more space in the main club area.