Populous, architects of the London 2012 Olympic stadium, Sochi 2014 Olympic stadium and Soccer City 2010 World Cup stadium, have been selected as designers of the new Rostov Stadium. This will be the fourth stadium that Populous has designed in Russia to be used for the 2018 World Cup, together with Kazan, Saransk, Sochi.
http://www.evolo.us/architecture/2018-world-cup-stadium-in-rostov-russia-populous/
http://www.evolo.us/architecture/2018-world-cup-stadium-in-rostov-russia-populous/