New Theme releases can be downloaded from your UD Account
At the moment already available
You will need to update theme manually(Download from UD Account and upload to your site). There is a slight change in a method, that is the reason why notifications about new releases of themes will be only available after you will have
Denali 4.*.*, so after you will update your theme manually(you will need to do this only once), you will start seeing notifications about new releases again.