From the Times Dispatch article:

The new American Civil War Museum will create a contemporary L-shaped building in the courtyard at Historic Tredegar to unite the site and the Civil War experience.
Renderings for the stone and brick building were released Monday by the museum, which unites the Museum of the Confederacy and the American Civil War Center at Historic Tredegar.
The new building will wrap around the Foundry building, home to the American Civil War Center, and replace a much smaller brick-and-glass entry. The current exhibit in that building, “In the Cause of Liberty,” will close after Thanksgiving. In the new setup, the Foundry building will become a multipurpose space for conferences or events.
The main entrance of the new building will face the plaza and be at a right angle to the entrance of the Pattern Building, where the Richmond National Battlefield Park visitor center is located. The visitor center will remain open throughout the construction.