What-s-new Definition

noun

(idiomatic) The 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.

Wiktionary

phrase

(idiomatic) An informal greeting asking the other person what has recently happened in their lives. A typical response might be, "Not much, you?". At times the greeting may not be literal and might just be used as a synonym for hello or what's up.

Wiktionary

(rhetorical question, idiomatic, sarcastic) Implies that the situation is and always has been unsatisfactory.

You're still having problems with that idiot you employed last year? So, what's new?

Wiktionary