Today, October 24th 2017, the product roadmap for Microsoft Teams was released via the Microsoft Technical Community (original blog post here). A link to the roadmap can be found here and reflects Microsoft's current expectations about Skype for Business capabilities coming to Teams. Note that dates and individual features may change and should not be relied upon in making purchasing decisions. An Ask Me Anything (AMA) for Microsoft Teams is being held on October 25th 2017 and can be found here – bring your roadmap questions!
Feel free to use this blog post as a future reference. Enjoy!