New features in Microsoft Teams make it an even more powerful hub for teamwork by enabling you to use apps in new ways—including the ability to command apps and take quick actions from the command box, as well as include content from an app in a conversation. This marks the biggest single release of new functionality since Teams launched last March.

Use your favorite apps in new ways in Teams

Teams brings together everything a team needs in one place. You can integrate the apps and services you need, including Office 365 apps like Excel, and ones from our partners, including Trello, InVision, and SurveyMonkey.

Microsoft

I think the biggest news from this is the App Galley they added.