Are the games and the interface in English?
Yes, the interface is in English by default, but it is also available in 10 other languages. You can change the language in the console options very easily. Concerning the games, those that have been published in English have the English version installed on the console, the other games are either in English or in the language of their country of origin if they have not been translated (which is very rare). Language is rarely a problem when playing!