How to get the new facebook inbox?

The new Facebook inbox is when your CHAT messages go to your Inbox, and all your messages are combined into one thread . Example , if you was to start a new message it would still show up in one thread instead of a new message. Why dont I have the new one? :(|||you have to be invited to get it early find somebody who has it and ask them to invite you to it or just wait and you will be advently forced into it|||It is not ready yet