You may already know Sway; if not you can take a look at the announcement published earlier in October 2014 http://blogs.office.com/2014/10/01/announcing-office-sway-reimagine-ideas-come-life/. To quickly give an idea of what is Sway, it is a new web application to give you a quickest way to create,edit and share content with others. Currently this is a public – meaning not organization targeted – service like OneDrive or Skype (OneDrive for Business or Skype for Business are organization targeted offering for example).
Today, it has been announced that Sway will be part of Office 365 too. If you have the First Release settings enabled, you will get Sway in the next few weeks.
To know more about this announcement, go to http://aka.ms/o365sway_mc