According to the website, the new sports saloon concept is named IBL and it measures 4,670mm long and has a wheelbase of 2,710mm. This means it is the same size as the current Seat Exeo sedan (4,670mm long with a wheelbase of 2,642mm), which is based on the previous generation Audi A4.
The concept most likely previews a new sedan for Seat, though at this point we do not know if it depicts a replacement for the Toledo, the Exeo or a different model altogether.