Here is an entry on ANet's official blog detailing the ambient sounds and voice-overs you will encounter while traversing through Guild Wars 2.

Talking Heads: VO and Dialogue in GW2


I recommend reading the Divinity's Reach summary and taking a brief listen-in on the actual recorded ambient sounds from townspeople that will be heard in the town itself. Pretty lifelike.

This is excellent. It's so real.