At this time there are no known plans that we are aware of. We will be meeting with the product group in the coming days and will share your request.
At this time, if you wish to purchase a wildcard certificate in Azure, you would need to purchase an App Service Certificate. For details on the differences, please see here.
To track feature and product updates, please see here.
We also would suggest you create a feature request here as this is the site the product group uses to collect feedback from the community for future ideas. This will help to formalize your request.
Let us know if you have any further questions or concerns.