@Bryan Hall 


I'd agree with your theory on the rebranding Phone System + Calling Plans, especially with the demise of SfB Online next year, there's no reason to have a "common" name for a product if you're only using it under a single line.  I'm sure you'll still see Phone System be its own license as it's used for Voice Mail services as well, and required for Direct Routing to be able to use PSTN services.


I'd not expect the Teams Calling to be included in the Advanced Communications SKU, as that seems to be targeted towards better functionality in the meeting space, specifically larger collaborations, live meetings, and customizations.