It’s been registered and they won’t be sending a new tracking number. That message is a generic message and your husband will receive the gcms note when is ready
You can keep checking for the America visa appointment to see if anyone has cancelled to get earlier date. My friend did this but you have to check every day especially in evenings
I got asked for interview and also provide scan copies of my international passport, bring all the original copies of attached documents to my application, PR card and another piece of government ID
Because you order for supporting documents in the applications instead of just status update that people usually go for, you’re requires them to share files in your application