If someone refers to a brave new world , they are talking about a situation or system that has recently been created and that people think will be successful and fair.
...the brave new world of internet banking.
N-SING : usu N of n
BRAVE NEW WORLD
Meaning of BRAVE NEW WORLD in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006