According to EA, FIFA 17 demo is set to be released in “early September” – The exact date hasn’t been confirmed yet.
Here are the available clubs in FIFA 17 demo: Real, Madrid, Manchester City, Manchester United, Chelsea, Olympique Lion, Paris Saint-Germain, Seattle Sounders, UANL Tigres, FC Bayern Munich, Gamba Osaka, Inter Mailand und Juventus.
And these are the stadiums: Stamford Bridge, Suita City Football Stadium and Centutylink Field.
EA says that these content and details may change for the actual FIFA 17 Demo. You can find the latest info on demo and its download links once confirmation at www.fifplay.com/fifa-17-demo