As you already know, you can integrate your applications or third party SaaS applications with Azure AD using the Azure AD Application Gallery.
The next time you go to integrate a new application with your Azure AD, you may want to switch to the new and refreshed gallery, which provides a cleaner and simpler view.
When you switch to the new AAD application gallery interface you will get more options for searching existing SaaS applications by filtering by single-sign on, account management or category.
If you are using AAD Application Proxy, the options to add a new application or manage the proxy agents are immediately available from the On-premises applications section
Finally it is becoming easier to identify which features (Federated SSO and/or user provisioning) the catalogued applications are providing thanks to icons displayed
As this new view is in preview, it is possible that some function/feature may change.