Tyson's corner is in Northern Virginia, where the 495 beltway hits I66 (roughly). I was actually in the mall Wednesday, and there is a blank storefront where the Tesla Store will be. Right next to the microsoft store actually. (I was somewhat amused by that placement). No visual indicators that it's going to be a tesla store, just a blank wall atm (although the mall directory does have "Tesla Motors, coming soon" on the map there.