Rather than offering a universal binary right now alongside the announcement, Microsoft instead announced vague plans to automatically roll out the update "to customers in increments over the coming months." (Members of Microsoft's Insider program have had access to an M1-native version of Teams in beta since April.).
When Apple launched its first M1-equipped Macs in late 2020, we wrote about how impressed we were with Rosetta 2—in most cases, many users wouldn't even know they were running legacy Intel versions of their applications instead of Apple Silicon-native versions if they weren't told.But nonetheless, users can expect native software to be more performant, and we'd expect nothing less from Teams.