A new item before they let you loose with your licence is that you will have to watch a road safety video, which is about an hour long.
Yes, it is boring and much of what they suggest leaves you scratching your head as it is not how I would do things (we were taught to drive in the UK where standards are very demanding). But stick with it, enjoy the brilliant sub titles (it's naturally in Thai) and once you have seen the back of that, a chap comes into the room with all your final paperwork.
Take it over to the other side of the building for your final document check and pose for your photo. Quite wonderfully they will ask you to look at your picture for approval and if you don't like it, they will re-do.
Thereafter they will print your licences (two in our case) and you're free to leave.