809 Upshur St NW, the red brick building that used to be a small church and is now vacant, will be a restaurant focusing on pizza, Timber Pizza Co.
According to a neighbor who saw them out taking pictures of the building and confirmed later by Popville, Timber Pizza will open a local restaurant featuring their wood-fired pizzas. I've reached out to one of the property owners as well as Timber Pizza and will update as I hear more.
Update: I spoke with Andrew Dana, one of the owners of Timber Pizza, and he confirmed they're planning on opening in late fall or early winter, later this year. "It's true! We are incredible excited to become a part of the Petworth family!"
According to their website, I think this would be their first location besides a food truck: