It's been five years since Microsoft released Office 2011 for the Mac, so the absence of any major, headline-grabbing new features could be seen as something of a disappointment. However, Office 2016 for Mac does make sense when seen as part of Microsoft's attempt to provide a 'unified' look and feel that allows Office users to move easily across platforms and devices.
At the moment, Office 2016 for Mac is available as a free upgrade for users who have an existing subscription to Office 365. Businesses with volume licensing agreements with Microsoft can upgrade for free as well, although they have to wait until August. There will also be a conventional boxed version of the suite released in September. Microsoft was unable to confirm UK pricing for that version ahead of its release, although it's likely to be similar to the current £219.99 (inc. VAT) for the Home and Business edition of Office 2011 for Mac.