Yesterday was announced in the Techcommunity the roadmap for Microsoft Teams.
I want to highlight the integration between the Skype For Business client and the Microsoft Teams client. With this integration we will be able to share the presence, contacts between this two applications and even to call between this two applications. In a near future, we will have the PSTN calling plans for Teams and more features yet to come.
If you want more information about this, visit the following link: https://techcommunity.microsoft.com/t5/Microsoft-Teams-Blog/Roadmap-for-Skype-for-Business-capabilities-coming-to-Microsoft/bc-p/120002#M340