In pre-release documentation, Microsoft mentioned the addition of a new marketing channel i.e. SMS marketing.
Marketers can truly go mobile. As a modern mobile marketer, you can create powerful SMS campaigns as well as integrate SMS marketing in your multi-channel campaigns. In this release, Dynamics Marketing will support both outbound and inbound SMS marketing in select markets. This means ability to:
1.) configure inbound SMS campaigns with SMS keywords to get SMS opt-ins
2.) maintain a database of opt-in and opt-out preferences of your marketing contacts
3.) send outgoing promotional SMS messages to opted in contacts for SMS
4.) tracking performance of your SMS campaigns
The capability to integrate SMS marketing in multi-channel campaigns truly stands out Dynamics Marketing in mobile marketing space and enhances its positioning as one of the best multi-channel integrated marketing management clouds for the modern marketer.
Power Platform Pulse 
Hello, which select markets do they mean here? ‘Microsoft Dynamics Marketing will support both outbound and inbound SMS marketing in select markets. “