Google Hangouts can now bypass Google’s Servers and Place Calls using a direct peer-to-peer connection. This new change will reduces the number of hoops your call needs to jump through, and also improving audio and video quality.
On the downside, establishing a connection this way reveals both of your IP addresses. This makes it possible to get an approximate idea of your location. For most people, this won’t be a problem. Grandma already knows where you live. But if you’re conducting an interview and want to keep your location a secret, this is something to look out for.