1.NounThe latest developments in a particular situation or a person's life.
"We send out a newsletter to our clients every week to tell them what's new in the company."
2.PhraseAn informal greeting asking the other person what has recently happened in their life. A typical response might be "Not much; you?". The greeting is not always literal and may just be used to say hello.
3.PhraseA rhetorical request for some real news, on hearing a report that was not news because it represents a continuing predictable and unsatisfactory situation.
"You're still having problems with that idiot you employed last year? So, what's new?"