How about that?

Meaning

A remark used to express surprise at a piece of news or an observation. It serves as a polite way to acknowledge a fact without having to offer a lengthy opinion.

Casual, observant

Used in a sentence

• I just found out my cousin is moving to Japan, how about that?
• They finally finished fixing the bridge in record time, how about that?
• You managed to find a parking spot right in front, how about that?