I fear this thread will bring all the spammers out of the woodwork to pimp their latest product. I wish there was a way I could make this visible only to people who already have 5 posts under their belts, but I can't.
Anyway, this last year has seen me heads down in Drupal projects and it's been a while since I've had a chance to pull my head out of the sand and survey the landscape.
I know some notable things have happened - Joomla included an update built on Bootstrap 3, which means responsive out of the box.
The Wordpress default 2014 theme is also mobile-friendly.
Drupal is lagging a bit - there are several topnotch mobile-first themes now (all the most popular contrib themes are now mobile first), but out-of-the-box responsive will await the release of Drupal 8, probably later this year.
But those are the big ones that get all the press. Is there a new tool that a couple years ago you didn't know about but now find essential for managing content or managing a CMS?
It could be a CMS (Perch?) or a dev tool (git, Jenkins, SeleniumIDE) or, I don't know, a new way to use Notepad that has changed the way you work and manage content or run your CMS.