As expected Apple announced the next evolution of their Operating System (OS X) at WWDC 2015 this year and having spent a little time with it I would like to share my thoughts with you.
The UI (User Interface) is very similar to OS X 10.10 "Yosemite" so in that regard it is like slipping on a comfortable pair of shoes and thus indicates that this release, on the face of it at least, is a refinement to the OS rather than an overhaul.
However there are a couple of minor tweaks that make the interface a little nicer place to be, the biggest of these is the font used. OS X is now using San Fransisco as it's system font, those with Apple Watch will be familiar with this, which adds a certain lightness to the UI which is pleasing.
Second is window management which has been updated to allow for split screening apps (when in full screen) which is a nice edition to the OS and lastly, or at least for things that I care about, the Mission Control feature has been refined removing what seems to be the last semblance of skeumorphism that remained in OS X.
This is harder to test especially on a modern high spec Retina MacBook Pro but certainly the whole OS feels quicker to respond and less laggy, although 10.10 was no slouch, apps are quicker to launch and battery life is improved in my tests.
Apple report the 'Under the Hood' changes being as follows, however I will need to spen much more time with OS X 10.11 in all of it's beta iterations to be totally convinced.
There is so much more with OS X 10.11 that would mean an incredibly long post but suffice to say the 'Snow Leopard / Mountain Lion' style release seems to be the new hotness for Apple and it seems to be working well.
OS X 10.11 El Capitan is due for release in Autumn 2015 and will be a free upgrade available and compatible with all macs that run OS X 10.10 Yosemite.