In case you missed it, on the eve of Microsoft Ignite, the Skype for Business Server 2015 build has been officially released – the RTM version is available for download on MSDN (thanks to fellow MVP Jeff Schertz for alerting me to this):
The download is 1.4 GB. Just a reminder, it is an in-place upgrade from Lync Server 2013 with no additional hardware requirements.
The TechNet documentation was released a couple of days ago and is available here: https://technet.microsoft.com/en-us/library/gg398616.aspx.
Fellow MVP Matt Landis has already done a nice job on a Step by Step Skype for Business Server 2015 In Place Upgrade blog post.
And lastly, Microsoft has already updated the Key Health Indicators for the new Skype release – available here: Key Health Indicators for Lync Server 2013 and Skype for Business Server 2015.