Hangouts update adds custom notification sounds for each chat

Hangouts is receiving a small update today, and while the changelog hasn't been updated on the Play Store just yet there are a few small differences we're noticing. First up is a new "hidden contacts" area of the settings separate from the "blocked people," giving you a way to hide folks from your contact listing but not block their messages completely. Individual chats can now have different notification sounds as well, letting you differentiate messages from calls and choose different sounds for different chat sessions.

source: androidcentral