Search for Skype for Business to filter the roadmap. In addition to listing updates available now, the roadmap also includes information about improvements that are coming soon. The Office 365 Roadmap is the official site for Office 365 updates and changes. The Skype for Business category filters the Office Blog to posts about Skype for Business only. Also, read how the updates enable new scenarios for others.
The Office Blog covers updates to Office 365. The Latest updates for versions of Skype for Business that use Windows Installer (MSI) page has information about and downloads for the most recent updates for the perpetual versions of Skype for Business 2016, Skype for Business 2015, and Lync 2013 clients. Each entry links to the release notes for that release. The Update history for Office 365 ProPlus page provides a list of the version and build numbers for each update to Office 365 ProPlus released in the following update channels: Monthly, Semi-Annual (Targeted), and Semi-Annual. The following are some other resources on what's new.
The Skype for Business Help Center is also continually updated with the latest changes. Skype for Business Online, as part of Office 365, is continually improved.